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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2019-05-08T13:39:55.3582625+00:00 -->
<!-- Version            : 3.4.7044.22220 -->
<!-- Package ID         : cdd5660d14c64a5fb4716ebfeb144072 -->
<!-- Copyright (c) 2019 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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        <link:definition>100450 - Disclosure - Loans (Details)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>100460 - Disclosure - Loans (Details 1)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureLoansDetails1Parenthetical" id="Role_DisclosureLoansDetails1Parenthetical">
        <link:definition>100470 - Disclosure - Loans (Details 1) (Parenthetical)</link:definition>
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        <link:definition>100480 - Disclosure - Loans (Details 2)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureLoansDetails3" id="Role_DisclosureLoansDetails3">
        <link:definition>100490 - Disclosure - Loans (Details 3)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureLoansDetails4" id="Role_DisclosureLoansDetails4">
        <link:definition>100500 - Disclosure - Loans (Details 4)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureLoansDetails5" id="Role_DisclosureLoansDetails5">
        <link:definition>100510 - Disclosure - Loans (Details 5)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureLoansDetails6" id="Role_DisclosureLoansDetails6">
        <link:definition>100520 - Disclosure - Loans (Details 6)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureLoansDetails7" id="Role_DisclosureLoansDetails7">
        <link:definition>100530 - Disclosure - Loans (Details 7)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureLoansDetails8" id="Role_DisclosureLoansDetails8">
        <link:definition>100540 - Disclosure - Loans (Details 8)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureTroubledDebtRestructuringsDetailsTextual" id="Role_DisclosureTroubledDebtRestructuringsDetailsTextual">
        <link:definition>100550 - Disclosure - Troubled Debt Restructurings (Details Textual)</link:definition>
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        <link:definition>100560 - Disclosure - Troubled Debt Restructurings (Details)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureCreditQualityIndicatorsDetailsTextual" id="Role_DisclosureCreditQualityIndicatorsDetailsTextual">
        <link:definition>100570 - Disclosure - Credit Quality Indicators (Details Textual)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureCreditQualityIndicatorsDetails" id="Role_DisclosureCreditQualityIndicatorsDetails">
        <link:definition>100580 - Disclosure - Credit Quality Indicators (Details)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureCreditQualityIndicatorsDetails1" id="Role_DisclosureCreditQualityIndicatorsDetails1">
        <link:definition>100590 - Disclosure - Credit Quality Indicators (Details 1)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureRevenueFromContractsWithCustomersDetails" id="Role_DisclosureRevenueFromContractsWithCustomersDetails">
        <link:definition>100600 - Disclosure - Revenue from Contracts with Customers (Details)</link:definition>
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        <link:definition>100610 - Disclosure - Revenue from Contracts with Customers (Details Textual)</link:definition>
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        <link:definition>100620 - Disclosure - Interest-Rate Swaps (Details)</link:definition>
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        <link:definition>100630 - Disclosure - Interest-Rate Swaps (Details Textual)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureEarningsPerShareDetails" id="Role_DisclosureEarningsPerShareDetails">
        <link:definition>100640 - Disclosure - Earnings Per Share (Details)</link:definition>
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      <link:roleType roleURI="http://www.farmersbankgroup.com/20190331/taxonomy/role/DisclosureEarningsPerShareDetailsTextual" id="Role_DisclosureEarningsPerShareDetailsTextual">
        <link:definition>100650 - Disclosure - Earnings Per Share (Details Textual)</link:definition>
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        <link:definition>100660 - Disclosure - Stock Based Compensation (Details Textual)</link:definition>
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        <link:definition>100670 - Disclosure - Stock Based Compensation (Details)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>100680 - Disclosure - Other Comprehensive Income (Loss) (Details)</link:definition>
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        <link:definition>100690 - Disclosure - Regulatory Capital Matters (Details Textual)</link:definition>
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        <link:definition>100700 - Disclosure - Regulatory Capital Matters (Details)</link:definition>
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        <link:definition>100710 - Disclosure - Fair Value (Details)</link:definition>
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        <link:definition>100720 - Disclosure - Fair Value (Details Textual)</link:definition>
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        <link:definition>100730 - Disclosure - Fair Value (Details 1)</link:definition>
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        <link:definition>100740 - Disclosure - Fair Value (Details 2)</link:definition>
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        <link:definition>100750 - Disclosure - Fair Value (Details 3)</link:definition>
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        <link:definition>100760 - Disclosure - Fair Value (Details 4)</link:definition>
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        <link:definition>100770 - Disclosure - Segment Information (Details)</link:definition>
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        <link:definition>100780 - Disclosure - Leases (Details Textual)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>100790 - Disclosure - Leases (Details)</link:definition>
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        <link:definition>100810 - Disclosure - Goodwill and Intangible Assets (Details Textual)</link:definition>
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        <link:definition>100820 - Disclosure - Goodwill and Intangible Assets (Details)</link:definition>
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  <xsd:element id="fmnb_StockIssuedDuringPeriodSharesUnderLongTermIncentivePlan" name="StockIssuedDuringPeriodSharesUnderLongTermIncentivePlan" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_ProceedsFromSaleOfEquitySecurities" name="ProceedsFromSaleOfEquitySecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_PurchaseOfEquitySecurities" name="PurchaseOfEquitySecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_PurchaseOfRestrictedStock" name="PurchaseOfRestrictedStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_SecurityPurchasesNotSettled" name="SecurityPurchasesNotSettled" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_IssuanceOfStockAwards" name="IssuanceOfStockAwards" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_TroubledDebtRestructuringsTextBlock" name="TroubledDebtRestructuringsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_PurchasedCreditImpairedLoansTableTextBlock" name="PurchasedCreditImpairedLoansTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_ImpairedLoansAcquiredAccretableYieldChangeTableTextBlock" name="ImpairedLoansAcquiredAccretableYieldChangeTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_InvestmentInResidentialConsumerAndIndirectAutoLoansBasedOnPaymentActivityTableTextBlock" name="InvestmentInResidentialConsumerAndIndirectAutoLoansBasedOnPaymentActivityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_SummaryOfSignificantAccountingPoliciesAdditionalTextualAbstract" name="SummaryOfSignificantAccountingPoliciesAdditionalTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ResidentialCollateralizedMortgageObligationsMember" name="ResidentialCollateralizedMortgageObligationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_SmallBusinessAdministrationMember" name="SmallBusinessAdministrationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_NumberOfSecurities" name="NumberOfSecurities" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_NumberOfSecuritiesOnUnrealizedLossPosition" name="NumberOfSecuritiesOnUnrealizedLossPosition" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_OriginatedLoansMember" name="OriginatedLoansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_AcquiredLoansMember" name="AcquiredLoansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CommercialRealEstateOwnerOccupiedMember" name="CommercialRealEstateOwnerOccupiedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CommercialRealEstateNonOwnerOccupiedMember" name="CommercialRealEstateNonOwnerOccupiedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CommercialRealEstateFarmlandMember" name="CommercialRealEstateFarmlandMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CommercialRealEstateOtherMember" name="CommercialRealEstateOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CommercialCommercialAndIndustrialMember" name="CommercialCommercialAndIndustrialMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember" name="ResidentialRealEstateOneToFourFamilyResidentialMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CommercialAgriculturalMember" name="CommercialAgriculturalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ResidentialRealEstateHomeEquityMember" name="ResidentialRealEstateHomeEquityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ConsumerIndirectMember" name="ConsumerIndirectMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ConsumerDirectMember" name="ConsumerDirectMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ConsumerOtherMember" name="ConsumerOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisitionOutstandingBalance" name="CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisitionOutstandingBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisitionNetCarryingValue" name="CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisitionNetCarryingValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_NationalBancsharesCorporationMember" name="NationalBancsharesCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_TroubledDebtRestructuringsMember" name="TroubledDebtRestructuringsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_DebtInstrumentInterestRateReductionPercentage" name="DebtInstrumentInterestRateReductionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_DebtInstrumentMaturityDateLengthOfExtensionPeriod" name="DebtInstrumentMaturityDateLengthOfExtensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_FinancingReceivablePeriodOfModifiedContractuallyPastDueLoansToBeConsideredAsPaymentDefault" name="FinancingReceivablePeriodOfModifiedContractuallyPastDueLoansToBeConsideredAsPaymentDefault" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_CommercialLoanAndCommercialRealEstateRiskMaximum" name="CommercialLoanAndCommercialRealEstateRiskMaximum" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_CommercialFarmlandMember" name="CommercialFarmlandMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CommercialAndIndustrialMember" name="CommercialAndIndustrialMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_TrustSegmentMember" name="TrustSegmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_BankSegmentMember" name="BankSegmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_RetirementConsultingSegmentMember" name="RetirementConsultingSegmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ContingentFeesAndCommissionsDebitCardsReceivable" name="ContingentFeesAndCommissionsDebitCardsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_RevenueFromContractWithCustomerLineItems" name="RevenueFromContractWithCustomerLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_RevenueFromContractWithCustomerTable" name="RevenueFromContractWithCustomerTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CeteraMember" name="CeteraMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_ContingentFeesAndCommissionsFiduciaryAndTrustActivitiesReceivable" name="ContingentFeesAndCommissionsFiduciaryAndTrustActivitiesReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_ContingentInsuranceCommissionsAndFeesReceivable" name="ContingentInsuranceCommissionsAndFeesReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_PercentageOfInsuranceCommissionsOnRevenues" name="PercentageOfInsuranceCommissionsOnRevenues" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_PercentageOfRetirementPlanConsultingFeesOnRevenues" name="PercentageOfRetirementPlanConsultingFeesOnRevenues" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_ContingentBrokerageCommissionsRevenuePayable" name="ContingentBrokerageCommissionsRevenuePayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_PercentageOfInvestmentCommissionsOnRevenues" name="PercentageOfInvestmentCommissionsOnRevenues" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_WeightedAveragePayRateOnInterestRateSwaps" name="WeightedAveragePayRateOnInterestRateSwaps" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_WeightedAverageInterestRateReceivedInterestRateSwaps" name="WeightedAverageInterestRateReceivedInterestRateSwaps" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_TwoThousandAndSeventeenIncentivePlanMember" name="TwoThousandAndSeventeenIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_TimeBasedRestrictedStockAwardsMember" name="TimeBasedRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_PerformanceBasedRestrictedStockAwardsMember" name="PerformanceBasedRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_TwoThousandAndTwelveIncentivePlanMember" name="TwoThousandAndTwelveIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_TwoThousandAndSeventeenIncentivePlanAndTwoThousandAndTwelveIncentivePlanMember" name="TwoThousandAndSeventeenIncentivePlanAndTwoThousandAndTwelveIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_RegulatoryMattersAdditionalTextualAbstract" name="RegulatoryMattersAdditionalTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio" name="TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio" name="TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio" name="CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_AdditionalCapitalConservationBufferRatio" name="AdditionalCapitalConservationBufferRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssets" name="TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_TierOneCommonCapitalRatioAbstract" name="TierOneCommonCapitalRatioAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_TierOneCommonCapital" name="TierOneCommonCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_TierOneCommonCapitalRatio" name="TierOneCommonCapitalRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacy" name="TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacy" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_TierOneRiskBasedCommonCapitalRequiredToBeWellCapitalized" name="TierOneRiskBasedCommonCapitalRequiredToBeWellCapitalized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_TierOneRiskBasedCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" name="TierOneRiskBasedCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_AvailableForSaleSecuritiesDebtAndEquity" name="AvailableForSaleSecuritiesDebtAndEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_FairValueAssetsAndLiabilitiesLevel1AndLevel2TransfersAmount" name="FairValueAssetsAndLiabilitiesLevel1AndLevel2TransfersAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_CollateralDependentImpairedLoansMember" name="CollateralDependentImpairedLoansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncrease" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepaymentsCallsAndMaturities" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepaymentsCallsAndMaturities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_OtherRealEstateOwnedPortfolioSegmentMember" name="OtherRealEstateOwnedPortfolioSegmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_OneToFourFamilyResidentialMember" name="OneToFourFamilyResidentialMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_CashCashEquivalentsAndFederalFundsSoldFairValue" name="CashCashEquivalentsAndFederalFundsSoldFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_RestrictedStockFairValue" name="RestrictedStockFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_AccruedInterestReceivableFairValue" name="AccruedInterestReceivableFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmnb_AccruedInterestPayableFairValue" name="AccruedInterestPayableFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmnb_MaximumMaturityPeriodOfShortTermBorrowings" name="MaximumMaturityPeriodOfShortTermBorrowings" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_EliminationsAndReconcilingItemsMember" name="EliminationsAndReconcilingItemsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmnb_LesseeOperatingLeaseAndFinancingLeaseDiscountRate" name="LesseeOperatingLeaseAndFinancingLeaseDiscountRate" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_OperatingLeaseAndFinancingLeaseWeightedAverageRemainingLeaseTerm" name="OperatingLeaseAndFinancingLeaseWeightedAverageRemainingLeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmnb_NumberOfLendingInstitutions" name="NumberOfLendingInstitutions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="fmnb_PledgedSecuritiesPercentageOfRepurchaseAgreementBalances" name="PledgedSecuritiesPercentageOfRepurchaseAgreementBalances" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
</xsd:schema>
