<SEC-DOCUMENT>0001127602-18-028434.txt : 20180926
<SEC-HEADER>0001127602-18-028434.hdr.sgml : 20180926
<ACCEPTANCE-DATETIME>20180926162948
ACCESSION NUMBER:		0001127602-18-028434
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180925
FILED AS OF DATE:		20180926
DATE AS OF CHANGE:		20180926

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			McGurk Monica Houle
		CENTRAL INDEX KEY:			0001665306

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12762
		FILM NUMBER:		181088243

	MAIL ADDRESS:	
		STREET 1:		6584 POPLAR AVENUE
		CITY:			MEMPHIS
		STATE:			TN
		ZIP:			38138

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MID AMERICA APARTMENT COMMUNITIES INC.
		CENTRAL INDEX KEY:			0000912595
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				621543819
		STATE OF INCORPORATION:			TN
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		6815 POPLAR AVENUE
		STREET 2:		SUITE 500
		CITY:			GERMANTOWN
		STATE:			TN
		ZIP:			38138
		BUSINESS PHONE:		9016826600

	MAIL ADDRESS:	
		STREET 1:		6815 POPLAR AVENUE
		STREET 2:		SUITE 500
		CITY:			GERMANTOWN
		STATE:			TN
		ZIP:			38138

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MID AMERICA APARTMENT COMMUNITIES INC
		DATE OF NAME CHANGE:	19930927
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-09-25</periodOfReport>

    <issuer>
        <issuerCik>0000912595</issuerCik>
        <issuerName>MID AMERICA APARTMENT COMMUNITIES INC.</issuerName>
        <issuerTradingSymbol>MAA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001665306</rptOwnerCik>
            <rptOwnerName>McGurk Monica Houle</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6815 POPLAR AVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 500</rptOwnerStreet2>
            <rptOwnerCity>GERMANTOWN</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>38138</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1391</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2018-09-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>185</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>100.94</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>185</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4542.4801</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each share of phantom stock is the economic equivalent of one share of common stock. The shares of phantom stock are payable in two equal annual installments beginning within the 90 days following the calendar year in which the reporting person ceases to serve as a director, in cash or common stock, at the election of the reporting person.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Leslie Wolfgang</signatureName>
        <signatureDate>2018-09-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
