UpAlphabetical listing of Places in Ontario
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Dacre | city | Ontario | Canada | 45.37 | -76.96 | 830 | 221 |
| Dalkeith | city | Ontario | Canada | 45.45 | -74.57 | 219 | 664 |
| Dalton | city | Ontario | Canada | 48.15 | -84.03 | 1112 | 0 |
| Dalton Mills | city | Ontario | Canada | 48.12 | -84.07 | 1669 | 0 |
| Dane | city | Ontario | Canada | 48.07 | -80.02 | 1013 | 478 |
| Dashwood | city | Ontario | Canada | 43.35 | -81.64 | 830 | 596 |
| Dayton | city | Ontario | Canada | 46.23 | -83.33 | 830 | 98 |
| Dean Lake | city | Ontario | Canada | 46.20 | -83.15 | 830 | 91 |
| Dearlock | city | Ontario | Canada | 48.82 | -94.11 | 1131 | 106 |
| Deep River | city | Ontario | Canada | 46.10 | -77.50 | 830 | 2036 |
| Deep River | city | Ontario | Canada | 46.17 | -77.57 | 367 | 198 |
| Deep River Depot | city | Ontario | Canada | 46.17 | -77.57 | 367 | 198 |
| Deer Lake | city | Ontario | Canada | 52.62 | -94.07 | 1000 | 491 |
| Delamare | city | Ontario | Canada | 46.17 | -80.70 | 830 | 0 |
| Delamere | city | Ontario | Canada | 46.17 | -80.70 | 830 | 0 |
| Delaware | city | Ontario | Canada | 42.91 | -81.42 | 830 | 6033 |
| Delhi | city | Ontario | Canada | 42.86 | -80.49 | 830 | 4554 |
| Delta | city | Ontario | Canada | 44.61 | -76.12 | 334 | 838 |
| Demorestville | city | Ontario | Canada | 44.09 | -77.21 | 321 | 637 |
| Denbigh | city | Ontario | Canada | 45.15 | -77.25 | 1082 | 149 |
| Denfield | city | Ontario | Canada | 43.13 | -81.43 | 885 | 881 |
| Depot Harbour | city | Ontario | Canada | 45.32 | -80.08 | 830 | 2960 |
| Desbarats | city | Ontario | Canada | 46.33 | -83.93 | 830 | 385 |
| Deseronto | city | Ontario | Canada | 44.20 | -77.03 | 246 | 4125 |
| Deux Rivieres | city | Ontario | Canada | 46.25 | -78.28 | 830 | 0 |
| Devlin | city | Ontario | Canada | 48.60 | -93.68 | 1151 | 456 |
| Devonshire | city | Ontario | Canada | 48.82 | -80.82 | 964 | 416 |
| Dinorwic | city | Ontario | Canada | 49.70 | -92.50 | 1669 | 0 |
| Dinorwick | city | Ontario | Canada | 49.70 | -92.50 | 1669 | 0 |
| Domville | city | Ontario | Canada | 44.76 | -75.56 | 354 | 5003 |
| Don Mills | city | Ontario | Canada | 43.73 | -79.33 | 830 | 388591 |
| Dorchester | city | Ontario | Canada | 42.99 | -81.06 | 830 | 5682 |
| Dorset | city | Ontario | Canada | 45.23 | -78.88 | 1669 | 126 |
| Douglas | city | Ontario | Canada | 45.51 | -76.94 | 830 | 357 |
| Douro | city | Ontario | Canada | 44.38 | -78.20 | 830 | 1387 |
| Downie | city | Ontario | Canada | 43.33 | -81.05 | 1171 | 7923 |
| Downsview | city | Ontario | Canada | 43.72 | -79.48 | 830 | 407967 |
| Drayton | city | Ontario | Canada | 43.76 | -80.67 | 1669 | 2569 |
| Dresden | city | Ontario | Canada | 42.60 | -82.18 | 830 | 4006 |
| Driftwood | city | Ontario | Canada | 49.13 | -81.38 | 915 | 0 |
| Drinkwater | city | Ontario | Canada | 48.58 | -81.02 | 1013 | 2314 |
| Drumbo | city | Ontario | Canada | 43.24 | -80.55 | 990 | 149 |
| Dryden | city | Ontario | Canada | 49.78 | -92.83 | 1249 | 7771 |
| Dublin | city | Ontario | Canada | 43.51 | -81.28 | 1099 | 351 |
| Dugwal | city | Ontario | Canada | 48.58 | -81.02 | 1013 | 2314 |
| Dunbarton | city | Ontario | Canada | 43.83 | -79.10 | 246 | 72951 |
| Dundalk | city | Ontario | Canada | 44.17 | -80.39 | 1689 | 3926 |
| Dundas | city | Ontario | Canada | 43.27 | -79.96 | 298 | 73357 |
| Dungannon | city | Ontario | Canada | 43.86 | -81.60 | 862 | 589 |
| Dunnville | city | Ontario | Canada | 42.91 | -79.62 | 830 | 4857 |
| Dunsford | city | Ontario | Canada | 44.45 | -78.63 | 895 | 1078 |
| Durham | city | Ontario | Canada | 44.18 | -80.82 | 1145 | 3265 |
| Dyer Bay | city | Ontario | Canada | 45.17 | -81.33 | 830 | 92 |
| Dyers Bay | city | Ontario | Canada | 45.17 | -81.33 | 830 | 92 |
| Dyment | city | Ontario | Canada | 49.62 | -92.32 | 1669 | 0 |
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