Cities and Communities in Southern Ontario
(check also Northern Ontario)
| Mabee's Corners | Martintown | Middleport | Monticello |
| Maberly | Maryhill | Middleville | Moonstone |
| Mackey | Marysville (Frontenac) | Midhurst | Moore Falls |
| MacTier | Marysville (Hastings) | Midland | Moorefield |
| Macton | Massey | Mikkola | Mooresburg |
| Madawaska | Massie | Mildmay | Mooretown |
| Madoc | Matawatchan | Milford | Moose Creek |
| Magnetawan | Mathers Corners | Milford Bay | Moose Point |
| Magnetawan (IR) | Mattawa | Millar Hill | Moraviantown |
| Maidstone | Maxville | Millarton | Morewood |
| Maitland | Maxwell | Millbank | Morganston |
| Malden Centre | Mayerville | Millbridge | Morpeth |
| Mallorytown | Maynard | Millbrook | Morrisburg |
| Mallorytown Landing | Maynooth | Milldale | Morriston |
| Malone | Maynooth Station | Miller Lake | Mortimers Point |
| Malton | McArthur Mills | Millerand | Morton |
| Manchester | McBean Harbour | Millgrove | Morven |
| Mandaumin | McCrackens Landing | Millhaven | Moscow |
| Manilla | McDonalds Corners | Milliken | Mossley |
| Manitowaning | McFarlane Lake | Milton | Mount Albert |
| Mannheim | McGregor | Milverton | Mount Brydges |
| Manotick | McGregor Bay | Mindemoya | Mount Carmel |
| Manotick Station | McGuire | Minden | Mount Chesney |
| Mansfield (Ottawa-Carleton) | McKays Corners | Miners Bay | Mount Elgin |
| Mansfield (Dufferin) | McKellar | Minesing | Mount Forest |
| Manvers | McKerrow | Minett | Mount Hope |
| Maple | McVitties | Minto (Hastings) | Mount Julian |
| Maple Island | Meadowside | Minto (Wellington) | Mount Pleasant (Brant) |
| Maple Lake | Meadowvale Village | Mississagi River | Mount Pleasant (Peterborough) |
| Maple Lake Park | Meaford | Mississauga | Mount Saint Patrick |
| Maple Leaf | Medina | Mississippi Mills | Mount Salem |
| Maple Valley | Melbourne | Mississippi Station | Mount Vernon |
| Mapleton | Meldrum Bay | Mitchell | Mountain |
| Mar | Melissa | Mitchell's Bay | Mountain Grove |
| Marathon Village | Melrose | Mitchell's Corners | Mountain View |
| Marden | Melville | Moffat | Muirkirk |
| Mariatown | Meneset | Moira | Muncey |
| Marionville | Merlin | Molesworth | Munsee-Delaware |
| Markdale | Merrickville | Moltke | Munster |
| Markham | Merrickville-Wolford | Monck | Muskoka Falls |
| Markstay | Metcalfe | Monetville | Musselman's Lake |
| Marlbank | Meyersburg | Monkland | Myers Cave |
| Marmora | Michael's Bay | Monkton | Myrtle |
| Marsville | Micksburg | Mono Centre | Myrtle Station |
| Martintown | Middlemiss | Mono Mills | |
| Mono Road |