allhx© has information on 2,667,166 address in Ontario. They're listed below by city or you can search for an address using the search box above.

A

Ajax (30,302)

B

Barrie (45,739) Belleville (19,617) Brampton (116,681) Brantford (34,129) Burlington (53,546)

C

Caledon (18,741) Cambridge (38,403) Chatham-Kent (33,283) Cornwall (18,759)

D

E

F

G

Greater Sudbury (49,090) Guelph (40,859)

H

Hamilton (160,143)

I

J

K

Kingston (43,103) Kitchener (67,456)

L

London (115,091)

M

Markham (62,652) Milton (21,634) Mississauga (146,317)

N

Newmarket (24,630) Niagara Falls (27,354) North Bay (18,594)

O

Oakville (52,039) Oshawa (49,782) Ottawa (280,230)

P

Peterborough (31,405) Pickering (24,666)

Q

R

Richmond Hill (46,404)

S

Sarnia (24,976) Sault Ste. Marie (27,257) St Catharines (42,200)

T

Thornhill (31,425) Thunder Bay (44,104) Timmins (16,092) Toronto (582,860)

U

V

Vaughan (50,542)

W

Waterloo (32,886) Welland (18,322) Whitby (35,949) Windsor (89,904)

X

Y

Z