| Enumerated Area | pre1851 | 1851 | 1861 | 1871 | 1881 | 1891 | 1901 | 1911 |
| Maberly Village | LNK | |||||||
| Macauley Twp | VIC | MUS | MUS | ONT | ONT | MUS | ||
| MacDonald Twp | ALG | ALG | ||||||
| Machar Twp | MUS | MUS | MUS | PSD | ||||
| Mack Twp | ALG | |||||||
| MacKinnon | ALG | |||||||
| MacKintosh Station | TBRR | |||||||
| Macklem | NIP | |||||||
| Maclean Twp | ONT | |||||||
| Maclennan Twp | NIP | |||||||
| Macpherson Twp | NIP | NIP | ||||||
| Madawaska Twp East | NIP | |||||||
| Madawaska Twp West | NIP | |||||||
| Madoc Twp | HAS | HAS | HAS | HAS | HAS | HAS | HAS | |
| Madoc Village | HAS | HAS | HAS | HAS | ||||
| Magnetawan Village | PSD | PSD | ||||||
| Maidstone Twp | ESS | ESS | ESS | ESS | ESS | ESS | ||
| Maidstone Village | ESS | |||||||
| Main Duck Islands | FRO | |||||||
| Maitland Village | GVL | |||||||
| Malahide Twp | ELG | ELG | ELG | ELG | ELG | ELG | ELG | ELG |
| Malden Twp | ESS | ESS | ESS | ESS | ESS | ESS | ESS | ESS |
| Mallorytown Village | LEE | |||||||
| Mamainse Twp | ALG | |||||||
| Manchester Village | ONT | |||||||
| Manilla Village | ONT | |||||||
| Manitou Rapids | TBRR | |||||||
| Manitou Twp | ALG | |||||||
| Manitoulin Twp | MAN | |||||||
| Manitowaning Indian Reserves | ALG | |||||||
| Manitowaning Village | ALG | ALG | ||||||
| Mann Twp | NIP | |||||||
| Manvers Twp | DUR | DUR | DUR | DUR | DUR | DUR | DUR | DUR |
| Maple Lane | LnA | |||||||
| Mapleton Village | ELG | |||||||
| Mar Village | BRU | |||||||
| Mara Twp | ONT | ONT | ONT | ONT | ONT | ONT | ONT | |
| March Twp | CAR | CAR | CAR | CAR | CAR | CAR | CAR | |
| Marden | WGT | |||||||
| Maria Twp | REN | REN | NIP | NIP | ||||
| Mariburg Village | PER | |||||||
| Marion Lake | TBRR | |||||||
| Mariposa Twp | VIC | VIC | VIC | VIC | VIC | VIC | VIC | |
| Markdale Village | GRY | GRY | GRY | |||||
| Markham Twp | YOR | YOR | YOR | YOR | YOR | YOR | YOR | YOR |
| Markham Village | YOR | YOR | YOR | YOR | ||||
| Marks Twp | TBRR | |||||||
| Marksville | ALG | |||||||
| Marlborough Twp | GVL | |||||||
| Marlborough Twp | CAR | CAR | CAR | CAR | CAR | CAR | CAR | CAR |
| Marlborough Twp (Carleton Co) | LNK | |||||||
| Marmora Twp | HAS | HAS | HAS | HAS | HAS | HAS | ||
| Marshville Village | WLD | |||||||
| Marson | TBRR | |||||||
| Marsville Village | DUF | |||||||
| Marter Twp | NIP | |||||||
| Martin | TBRR | |||||||
| Martin River | TBRR | |||||||
| Martin's Falls | YOR | |||||||
| Martland Twp | NIP | NIP | ||||||
| Maryborough Twp | WGT | WGT | WGT | WGT | WGT | WGT | WGT | |
| Marysburg North | PED | |||||||
| Marysburg South | PED | |||||||
| Marysburgh North Twp | PED | PED | PED | PED | ||||
| Marysburgh South Twp | PED | PED | PED | PED | ||||
| Marysburgh Twp | PED | |||||||
| Marysville Village | FRO | |||||||
| Mason | NIP | |||||||
| Massey Station | NIP | |||||||
| Massey Twp | ALG | |||||||
| Matawan Twp | NIP | |||||||
| Matawatchan Twp | REN | REN | REN | REN | REN | |||
| Matchedash Twp | SIM | SIM | SIM | SIM | SIM | SIM | ||
| Mather Twp | ALG | TBRR | ||||||
| Matheson Twp | NIP | |||||||
| Matilda Twp | DUN | DUN | DUN | DUN | DUN | DUN | DUN | |
| Mattawa | NIP | |||||||
| Mattawan Town | NIP | NIP | NIP | |||||
| Mattawan Twp | ALG | NIP | NIP | NIP | ||||
| Maxville Village | GLE | GLE | ||||||
| Maxwell Village | GRY | |||||||
| May | NIP | ALG | ||||||
| Maynooth Village | HAS | |||||||
| Mayo Twp | HAS | HAS | HAS | HAS | HAS | |||
| May's Claim | ALG | |||||||
| McCallum | NIP | |||||||
| McCann | NIP | |||||||
| McCart Twp | NIP | |||||||
| McClintock Twp | PET | VIC | VIC | |||||
| McClure | HAS | HAS | HAS | HAS | ||||
| McConkey Twp | MUS | MUS | PSD | |||||
| McCool Twp | NIP | |||||||
| McCraney Twp | NIP | |||||||
| McCrosson Twp | ALG | TBRR | ||||||
| McDonalds Corners | LNK | |||||||
| McDougall Twp | MUS | MUS | MUS | PSD | ||||
| McGillivray Twp | MID | HUR | HUR | MID | MID | MID | MID | MID |
| McGregor | ALG | |||||||
| McGregor Village | ESS | |||||||
| McIntyre | ALG | TBRR | ||||||
| McIntyres Corners | LnA | |||||||
| McIrvine Twp | ALG | TBRR | ||||||
| McKads Mine | TBRR | |||||||
| McKay Twp | REN | REN | REN | REN | REN | |||
| McKellar Twp | MUS | MUS | MUS | PSD | ||||
| McKellar Village | PSD | |||||||
| Mckenzie Twp | MUS | MUS | TBRR | |||||
| McKillop Twp | HUR | HUR | HUR | HUR | HUR | HUR | HUR | HUR |
| McKim Twp | NIP | NIP | NIP | |||||
| McLaughlin | NIP | |||||||
| Mclean Twp | MUS | MUS | ONT | MUS | ||||
| McMahon Twp | ALG | |||||||
| McMurrich Twp | MUS | MUS | MUS | PSD | ||||
| McNab Twp | REN | REN | REN | REN | REN | REN | REN | REN |
| McTavish Twp | TBRR | |||||||
| McVillie | NIP | |||||||
| McWilliams | NIP | |||||||
| Meaford Town | GRY | GRY | GRY | GRY | ||||
| Mechanicsville Village | CAR | |||||||
| Medonte Twp | SIM | SIM | SIM | SIM | SIM | SIM | ||
| Medora Peninsula | MUS | |||||||
| Medora Twp | MUS | MUS | SIM | SIM | MUS | |||
| Megrund | ALG | |||||||
| Melancthon Twp | GRY | GRY | GRY | GRY | GRY | GRY | DUF | |
| Melbourne Village | MID | |||||||
| Meldrum Bay Village | ALG | ALG | ||||||
| Melgund Twp | ALG | TBRR | ||||||
| Mellick Twp | TBRR | |||||||
| Melrose Village | HAS | |||||||
| Melville | PED | |||||||
| Menecauine | TBRR | |||||||
| Meredith | ALG | ALG | ||||||
| Merlin Village | KEN | |||||||
| Merrick | NIP | |||||||
| Merrickville Village | GVL | GVL | GVL | GVL | GVL | GVL | ||
| Merriton Village | LIN | LIN | LIN | LIN | ||||
| Merritt | NIP | ALG | ||||||
| Mersea Twp | ESS | ESS | ESS | ESS | ESS | ESS | ESS | |
| Metagama | NIP | ALG | ||||||
| Metcalfe Twp | MID | MID | MID | MID | MID | MID | MID | |
| Methuen Twp | PET | PET | PET | PET | PET | PET | ||
| Meyersburg Village | NUL |