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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 HvXA0qKy7FMQsUHJ+LXCYweq7FUF1EMgyZ0owZpPvAzh2AhRT6ul0I3zWM3k5MG3
 bVCI/c6IN6GCklSx3J1Viw==

<SEC-DOCUMENT>0001304546-05-000006.txt : 20050630
<SEC-HEADER>0001304546-05-000006.hdr.sgml : 20050630
<ACCEPTANCE-DATETIME>20050630101937
ACCESSION NUMBER:		0001304546-05-000006
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041231
FILED AS OF DATE:		20050630
DATE AS OF CHANGE:		20050630

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MFS MUNICIPAL INCOME TRUST
		CENTRAL INDEX KEY:			0000801961
		IRS NUMBER:				046554822
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		500 BOYLSTON ST
		STREET 2:		15TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		18006372929

	MAIL ADDRESS:	
		STREET 1:		500 BOYLSTON STREET
		STREET 2:		15TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FLAHERTY ROBERT R
		CENTRAL INDEX KEY:			0001244366

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-04841
		FILM NUMBER:		05926969

	MAIL ADDRESS:	
		STREET 1:		MFS INVESTMENT MANAGEMENT
		STREET 2:		500 BOYLSTON STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-12-31</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000801961</issuerCik>
        <issuerName>MFS MUNICIPAL INCOME TRUST</issuerName>
        <issuerTradingSymbol>MFM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001244366</rptOwnerCik>
            <rptOwnerName>FLAHERTY ROBERT R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>MFS INVESTMENT MANAGEMENT</rptOwnerStreet1>
            <rptOwnerStreet2>500 BOYLSTON STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Assistant Treasurer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>Robert R. Flaherty</signatureName>
        <signatureDate>2005-06-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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