| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oak Bay | city | Province du Quebec | Canada | 48.05 | -66.6166667 | 413 | 2425 |
| Obiduan | city | Province du Quebec | Canada | 48.6666667 | -74.95 | 1325 | 1415 |
| Obijuan | city | Province du Quebec | Canada | 48.6666667 | -74.95 | 1325 | 1415 |
| Oka | city | Province du Quebec | Canada | 45.4666667 | -74.0833333 | 75 | 7451 |
| Old Chelsea | city | Province du Quebec | Canada | 45.5 | -75.8166667 | 387 | 39104 |
| Old Factory | city | Province du Quebec | Canada | 52.6 | -78.7166667 | 0 | 0 |
| Old Factory River | city | Province du Quebec | Canada | 52.6 | -78.7166667 | 0 | 0 |
| Old Fort Bay | city | Province du Quebec | Canada | 51.4166667 | -57.8166667 | 0 | 91 |
| Omerville | city | Province du Quebec | Canada | 45.2833333 | -72.1166667 | 695 | 19270 |
| Ormstown | city | Province du Quebec | Canada | 45.1333333 | -74 | 127 | 3306 |
| Orsainville | city | Province du Quebec | Canada | 46.8833333 | -71.2833333 | 413 | 113051 |
| Oskelaneo | city | Province du Quebec | Canada | 48.1166667 | -75.2166667 | 1377 | 0 |
| Otter | city | Province du Quebec | Canada | 49.6166667 | -63.8 | 0 | 0 |
| Otterburn Park | city | Province du Quebec | Canada | 45.5333333 | -73.2166667 | 59 | 34857 |
| Outremont | city | Province du Quebec | Canada | 45.5166667 | -73.6166667 | 318 | 557754 |
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