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- (Gampaha District) Mutuwadiya
- (Gampaha District) Murutawala
- (Colombo District) Muruthagama
- (Kalutara District) Muruddeniya
- (Kalutara District) Munghena
- (Kalutara District) Munasinghagoda
- (Kalutara District) Munamalwatta
- (Kalutara District) Munagama
- (Gampaha District) Mulleyaya
- (Colombo District) Mulleriyawa North
- (Kalutara District) Mullapitiya
- (Colombo District) Mullegama
- (Gampaha District) Mulatiyana
- (Kalutara District) Mulatiyana
- (Gampaha District) Mukkama
- (Gampaha District) Mukalangedara
- (Gampaha District) Mukalangamuwa
- (Gampaha District) Mugurugampola Handurumulla
- (Gampaha District) Mugurugampola
- (Gampaha District) Mudungoda
- (Gampaha District) Muddaragama
- (Gampaha District) Mudagamuwa
- (Kalutara District) Mount Calvary
- (Gampaha District) Mottunna
- (Gampaha District) Morupola
- (Kalutara District) Morontuduwa
- (Gampaha District) Morenna
- (Kalutara District) Morawinna
- (Kalutara District) Morapitiya
- (Gampaha District) Moragoda