D
- (Perth County) Downie
- (United Counties of Leeds and Grenville) Dulcemaine
- (Parry Sound District) Dufferin Bridge
- (Hastings County) Duff Corners
- (District Municipality of Muskoka) Dudley
- (Manitoulin District) Dryden's Corner
- (United Counties of Leeds and Grenville) Drummond Island
- (Lanark County) Drummond Centre
- (Peterborough County) Drummond
- (Oxford County) Drumbo
- (Grey County) Dromore
- (Wellington County) Drayton
- (Wellington County) Dracon
- (Elgin County) Dunboyne
- (Wellington County) Downeys
- (Peterborough County) Douro
- (District Municipality of Muskoka) Dorset
- (Regional Municipality of Waterloo) Dorking
- (Thunder Bay District) Dorion
- (Peterborough County) Donwood
- (Huron County) Donnybrook
- (Renfrew County) Donegal
- (Frontenac County) Donaldson
- (United Counties of Leeds and Grenville) Domville
- (Regional Municipality of Niagara) Dunnville
- (Algoma) Dubreuilville
- (Bruce County) Dyer's Bay
- (Ottawa) Dwyer Hill
- (District Municipality of Muskoka) Dwight
- (Elgin County) Duttona Beach