| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| O'Brian Bay | city | Province of British Columbia | Canada | 50.9166667 | -126.8666667 | 88 | 11 |
| O'Brien | city | Province d' Ontario | Canada | 47.6833333 | -80.7333333 | 1230 | 33 |
| O'Leary | city | Province d' Ile-du-Prince-Edouard | Canada | 46.7 | -64.2166667 | 55 | 1863 |
| Oak Bay | city | Province of British Columbia | Canada | 48.4333333 | -123.3166667 | 16 | 98285 |
| Oak Bay | city | Province du Quebec | Canada | 48.05 | -66.6166667 | 413 | 2425 |
| Oak Lake | city | Province de Manitoba | Canada | 49.7666667 | -100.6333333 | 1420 | 477 |
| Oak Point | city | Province de Manitoba | Canada | 50.5 | -98.0333333 | 810 | 77 |
| Oakburn | city | Province de Manitoba | Canada | 50.5666667 | -100.5833333 | 1902 | 111 |
| Oakville | city | Province d' Ontario | Canada | 43.4333333 | -79.6666667 | 246 | 66499 |
| Oba | city | Province d' Ontario | Canada | 49.0666667 | -84.1 | 1164 | 14 |
| Oban | city | Province de Saskatchewan | Canada | 52.1166667 | -108.1333333 | 2099 | 53 |
| Obed | city | Province d' Alberta | Canada | 53.55 | -117.2166667 | 3766 | 33 |
| Obiduan | city | Province du Quebec | Canada | 48.6666667 | -74.95 | 1325 | 1415 |
| Obijuan | city | Province du Quebec | Canada | 48.6666667 | -74.95 | 1325 | 1415 |
| Ocean Falls | city | Province of British Columbia | Canada | 52.35 | -127.7 | 305 | 5 |
| Ocean View | city | Province d' Ile-du-Prince-Edouard | Canada | 46.0666667 | -62.8166667 | 282 | 732 |
| Ochiltree | city | Province of British Columbia | Canada | 52.2333333 | -121.8 | 3044 | 117 |
| Ochre | city | Province de Manitoba | Canada | 51.05 | -99.7833333 | 892 | 151 |
| Ochre River | city | Province de Manitoba | Canada | 51.05 | -99.7833333 | 892 | 151 |
| Oderin | city | Province of Newfoundland and Labrador | Canada | 47.2833333 | -54.8166667 | 0 | 5 |
| Ogema | city | Province de Saskatchewan | Canada | 49.5666667 | -104.9166667 | 2388 | 420 |
| Ogilvie | city | Territoire du Yukon | Canada | 63.5666667 | -139.7333333 | 1476 | 0 |
| Ogoki | city | Province d' Ontario | Canada | 51.6166667 | -85.9333333 | 498 | 54 |
| Oka | city | Province du Quebec | Canada | 45.4666667 | -74.0833333 | 75 | 7451 |
| Okanagan | city | Province of British Columbia | Canada | 50.3666667 | -119.35 | 1804 | 1015 |
| Okanagan Landing | city | Province of British Columbia | Canada | 50.2333333 | -119.3666667 | 1384 | 15858 |
| Okanogan | city | Province of British Columbia | Canada | 50.3666667 | -119.35 | 1804 | 1015 |
| Okotoks | city | Province d' Alberta | Canada | 50.7166667 | -113.9666667 | 3438 | 8353 |
| Old Bridgeport | city | Province de Nouvelle-Ecosse | Canada | 46.2166667 | -60.0166667 | 108 | 2194 |
| Old Chelsea | city | Province du Quebec | Canada | 45.5 | -75.8166667 | 387 | 39104 |
| Old Crow | city | Territoire du Yukon | Canada | 67.5666667 | -139.8 | 823 | 273 |
| 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 | city | Province of British Columbia | Canada | 55.05 | -126.3166667 | 2460 | 23 |
| Old Fort Bay | city | Province du Quebec | Canada | 51.4166667 | -57.8166667 | 0 | 91 |
| Old Hogem | city | Province of British Columbia | Canada | 55.7666667 | -125.95 | 5213 | 14 |
| Old Perlican | city | Province of Newfoundland and Labrador | Canada | 48.0833333 | -53.0166667 | 49 | 1044 |
| Old Wives | city | Province de Saskatchewan | Canada | 50.2 | -106 | 2286 | 22 |
| Olds | city | Province d' Alberta | Canada | 51.7833333 | -114.1 | 3398 | 5568 |
| Oliver | city | Province of British Columbia | Canada | 49.1833333 | -119.55 | 997 | 4626 |
| Omemee | city | Province d' Ontario | Canada | 44.3 | -78.55 | 846 | 3961 |
| Omerville | city | Province du Quebec | Canada | 45.2833333 | -72.1166667 | 695 | 19270 |
| Ompah | city | Province d' Ontario | Canada | 45.0166667 | -76.8333333 | 1003 | 75 |
| One Hundred Fifty Mile House | city | Province of British Columbia | Canada | 52.1166667 | -121.9333333 | 2349 | 201 |
| One Hundred Mile House | city | Province of British Columbia | Canada | 51.65 | -121.2833333 | 3008 | 1302 |
| Onefour | city | Province d' Alberta | Canada | 49.0666667 | -110.45 | 2933 | 42 |
| Onion Lake | city | Province de Saskatchewan | Canada | 53.7166667 | -110 | 1968 | 583 |
| Onoway | city | Province d' Alberta | Canada | 53.7 | -114.1833333 | 2335 | 1052 |
| Oona River | city | Province of British Columbia | Canada | 53.95 | -130.25 | 3 | 0 |
| Ootischenia | city | Province of British Columbia | Canada | 49.2833333 | -117.6166667 | 2982 | 3991 |
| Ootsa Lake | city | Province of British Columbia | Canada | 53.7833333 | -126.0333333 | 2929 | 10 |
| Opasatika | city | Province d' Ontario | Canada | 49.5333333 | -82.8666667 | 672 | 109 |
| Opasquia | city | Province d' Ontario | Canada | 53.2666667 | -93.5666667 | 964 | 0 |
| Opastika | city | Province d' Ontario | Canada | 49.5333333 | -82.8666667 | 672 | 109 |
| Open Hall | city | Province of Newfoundland and Labrador | Canada | 48.55 | -53.4833333 | 3 | 323 |
| Open Hole | city | Province of Newfoundland and Labrador | Canada | 48.55 | -53.4833333 | 3 | 323 |
| Orangedale | city | Province de Nouvelle-Ecosse | Canada | 45.9 | -61.1 | 45 | 540 |
| Orangeville | city | Province d' Ontario | Canada | 43.9166667 | -80.0833333 | 1397 | 17045 |
| Ordale | city | Province de Saskatchewan | Canada | 53.2666667 | -106.7 | 1624 | 80 |
| Orient Bay | city | Province d' Ontario | Canada | 49.3666667 | -88.1333333 | 869 | 5 |
| Orillia | city | Province d' Ontario | Canada | 44.6 | -79.4166667 | 738 | 28638 |
| Orleans | city | Province d' Ontario | Canada | 45.4666667 | -75.5166667 | 252 | 32935 |
| Ormstown | city | Province du Quebec | Canada | 45.1333333 | -74 | 127 | 3306 |
| Oromocto | city | Province of New Brunswick | Canada | 45.85 | -66.4666667 | 68 | 9907 |
| Oronocto | city | Province of New Brunswick | Canada | 45.85 | -66.4666667 | 68 | 9907 |
| Orrville | city | Province d' Ontario | Canada | 45.3833333 | -79.7833333 | 898 | 305 |
| Orsainville | city | Province du Quebec | Canada | 46.8833333 | -71.2833333 | 413 | 113051 |
| Osborne | city | Province de Manitoba | Canada | 49.5333333 | -97.3666667 | 777 | 326 |
| Oshawa | city | Province d' Ontario | Canada | 43.9 | -78.8666667 | 344 | 70566 |
| Oskelaneo | city | Province du Quebec | Canada | 48.1166667 | -75.2166667 | 1377 | 0 |
| Osland | city | Province of British Columbia | Canada | 54.1333333 | -130.1666667 | 0 | 67 |
| Osnaburgh | city | Province d' Ontario | Canada | 51.1333333 | -90.2666667 | 1223 | 15 |
| Osnaburgh House | city | Province d' Ontario | Canada | 51.1333333 | -90.2666667 | 1223 | 15 |
| Osoyoos | city | Province of British Columbia | Canada | 49.0333333 | -119.4666667 | 918 | 4302 |
| Otis | city | Province of New Brunswick | Canada | 45.9666667 | -67.2333333 | 298 | 1480 |
| Ottawa | city | Province d' Ontario | Canada | 45.4166667 | -75.7 | 246 | 201616 |
| Otter | city | Province du Quebec | Canada | 49.6166667 | -63.8 | 0 | 0 |
| Otter Creek | city | Province d' Ontario | Canada | 44.0833333 | -81.1333333 | 958 | 3532 |
| Otter Lake | city | Province d' Ontario | Canada | 45.3 | -79.9333333 | 813 | 1080 |
| Otterburn Park | city | Province du Quebec | Canada | 45.5333333 | -73.2166667 | 59 | 34857 |
| Otterburne | city | Province de Manitoba | Canada | 49.5 | -97.05 | 774 | 530 |
| Ouimet | city | Province d' Ontario | Canada | 48.75 | -88.5833333 | 748 | 239 |
| Oungre | city | Province de Saskatchewan | Canada | 49.1333333 | -103.8 | 2076 | 47 |
| Outlook | city | Province de Saskatchewan | Canada | 51.5 | -107.05 | 1719 | 2236 |
| Outram Station | city | Province de Saskatchewan | Canada | 49.1333333 | -103.3166667 | 1899 | 42 |
| Outremont | city | Province du Quebec | Canada | 45.5166667 | -73.6166667 | 318 | 557754 |
| Overton | city | Province de Nouvelle-Ecosse | Canada | 43.85 | -66.15 | 19 | 7423 |
| Owen Sound | city | Province d' Ontario | Canada | 44.5666667 | -80.85 | 1010 | 7195 |
| Owl River | city | Province d' Alberta | Canada | 54.8872222 | -111.8866667 | 1922 | 50 |
| Owlseye | city | Province d' Alberta | Canada | 54.0691667 | -111.4361111 | 2158 | 170 |
| Owlseye Lake | city | Province d' Alberta | Canada | 54.0691667 | -111.4361111 | 2158 | 170 |
| Oxbow | city | Province de Saskatchewan | Canada | 49.2166667 | -102.1666667 | 1758 | 1257 |
| Oxdrift | city | Province d' Ontario | Canada | 49.8166667 | -92.9833333 | 1197 | 16 |
| Oxford | city | Province de Nouvelle-Ecosse | Canada | 45.7333333 | -63.8666667 | 59 | 1883 |
| Oxford House | city | Province de Manitoba | Canada | 54.95 | -95.2666667 | 577 | 585 |
| Oxford Junction | city | Province de Nouvelle-Ecosse | Canada | 45.1833333 | -63.8833333 | 203 | 1176 |
| Oyama | city | Province of British Columbia | Canada | 50.1166667 | -119.3833333 | 1286 | 5946 |
| OʼBrian Bay | city | Province of British Columbia | Canada | 50.9166667 | -126.8666667 | 88 | 11 |
| OʼBrien | city | Province d' Ontario | Canada | 47.6833333 | -80.7333333 | 1230 | 33 |
| OʼLeary | city | Province d' Ile-du-Prince-Edouard | Canada | 46.7 | -64.2166667 | 55 | 1863 |