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- (Renfrew County) Budd Mills
- (Simcoe County) Buena Vista Park
- (Renfrew County) Bulgers Corners
- (Haliburton County) Buller
- (Hastings County) Buller Siding
- (Lanark County) Bullock
- (Grey County) Bunessan
- (Hastings County) Burgess Mines
- (Frontenac County) Burke Settlement
- (Durham) Burketon Station
- (Regional Municipality of Niagara) Burnaby
- (Northumberland County) Burnley
- (Perth County) Burns
- (Simcoe County) Burnside
- (Renfrew County) Burnstown
- (Frontenac County) Burnt Hills
- (Manitoulin District) Burpee
- (Frontenac County) Burridge
- (Rainy River District) Burriss
- (Rainy River District) Burriss
- (United Counties of Leeds and Grenville) Burritts Rapids
- (Durham) Burton
- (Parry Sound District) Burton
- (Cochrane District) Butler Island
- (Haliburton County) Buttermilk Falls
- (Simcoe County) Baxter
- (Ottawa) ByWard Market
- (District Municipality of Muskoka) Bala
- (Nipissing District) Bonfield
- (Oxford County) Burgessville