| Place | State | Latitude | Longitude | Elevation (meters) | Elevation (feet) |
|---|
| Old Fort Bay | Province of Quebec | 51.4166667 | -57.8166667 | | |
| Old Hogem | Province de Colombie-Britannique | 55.7666667 | -125.95 | 1680 | 5512 |
| Old Hogem | Province of British Columbia | 55.7666667 | -125.95 | 1680 | 5512 |
| Old Perlican | Province de Terre-Neuve-et-Labrador | 48.0833333 | -53.0166667 | -2 | -7 |
| Old Perlican | Province of Newfoundland and Labrador | 48.0833333 | -53.0166667 | -2 | -7 |
| Old Wives | Province of Saskatchewan | 50.2 | -106 | 695 | 2280 |
| Old Wives | Province de Saskatchewan | 50.2 | -106 | 695 | 2280 |
| Olds | Province of Alberta | 51.7833333 | -114.1 | 1038 | 3406 |
| Olds | Province d' Alberta | 51.7833333 | -114.1 | 1038 | 3406 |
| O'Leary | Province of Prince Edward Island | 46.7 | -64.2166667 | 24 | 79 |
| O'Leary | Province d' Ile-du-Prince-Edouard | 46.7 | -64.2166667 | 24 | 79 |
| Oliver | Province de Colombie-Britannique | 49.1833333 | -119.55 | 299 | 981 |
| Oliver | Province of British Columbia | 49.1833333 | -119.55 | 299 | 981 |
| Omemee | Province of Ontario | 44.3 | -78.55 | 253 | 830 |
| Omemee | Province d' Ontario | 44.3 | -78.55 | 253 | 830 |
| Omerville | Province du Quebec | 45.2833333 | -72.1166667 | 243 | 797 |
| Omerville | Province of Quebec | 45.2833333 | -72.1166667 | 243 | 797 |
| Ompah | Province of Ontario | 45.0166667 | -76.8333333 | 281 | 922 |
| Ompah | Province d' Ontario | 45.0166667 | -76.8333333 | 281 | 922 |
| One Hundred Fifty Mile House | Province de Colombie-Britannique | 52.1166667 | -121.9333333 | 749 | 2457 |
