| Area Code | Region | Start Time | End Time | Time Zone |
|---|
| 204 | Canada: Manitoba | 8 | 22 | CT |
| 226 | Canada: Ontario | 7 | 21 | ET |
| 236 | Canada: British Columbia (see 604) | 11 | 23 | PT,MT |
| 249 | Canada: Ontario overlay of area code 705 | 7 | 21 | ET |
| 250 | Canada: British Columbia (see 604) | 11 | 23 | PT,MT |
| 289 | Canada: S Cent. Ontario: Greater Toronto Area -- Durham, Halton, Hamilton-Wentworth, Niagara, Peel, York, and southern Simcoe County (excluding Toronto -- overlaid on 905, eff 6/9/01) | 7 | 21 | ET |
| 306 | Canada: Saskatchewan | 10 | 22 | MT,CT |
| 343 | Canada: SE Ontario: Ottawa | 7 | 21 | ET |
| 365 | Covers area codes 905 and its younger overlay 289 to form a 3 code overlay complex covering the same Ontario region: 905/289/365 | 7 | 21 | ET |
| 403 | Canada: Southern Alberta (see 780, 867) | 9 | 23 | MT |
| 416 | Canada: S Cent. Ontario: Toronto (see overlay 647, eff 3/5/01) | 7 | 21 | ET |
| 418 | Canada: NE Quebec: Quebec | 8 | 20 | ET,AT |
| 431 | Canada: Manitoba | 8 | 22 | CT |
| 437 | 437 is a new overlay area code serving the city of Toronto along with area codes 416 and 647 | 7 | 21 | ET |
| 438 | Canada: SW Quebec: Montreal city (overlaid on 514, [delayed until 2005] eff 10/10/03, mand 2/7/04) | 8 | 21 | ET |
| 450 | Canada: Southeastern Quebec; suburbs outside metro Montreal | 8 | 20 | ET,AT |
| 506 | Canada: New Brunswick | 7 | 20 | AT |
| 514 | Canada: SW Quebec: Montreal city (see overlay 438, eff 10/10/03, mand 2/7/04) | 8 | 21 | ET |
| 519 | Canada: SW Ontario: Windsor | 7 | 21 | ET |
| 579 | Canada: Southeastern Quebec; suburbs outside metro Montreal | 8 | 20 | ET,AT |
| 581 | Canada: NE Quebec: Quebec | 8 | 20 | ET,AT |
| 587 | Canada: Southern Alberta | 9 | 23 | MT |
| 604 | Canada: British Columbia: Greater Vancouver (overlay 778, perm 11/3/01; see 250) | 10 | 24 | PT |
| 613 | Canada: SE Ontario: Ottawa | 7 | 21 | ET |
| 639 | Canada: Saskatchewan | 10 | 22 | MT,CT |
| 647 | Canada: S Cent. Ontario: Toronto (overlaid on 416; eff 3/5/01) | 7 | 21 | ET |
| 705 | Canada: NW Ontario: Sault Ste. Marie/N Ontario: N Bay, Sudbury | 7 | 21 | ET |
| 709 | Canada: Newfoundland | 7 | 19 | AT,NT |
| 778 | Canada: British Columbia: Greater Vancouver (overlaid on 604, per 11/3/01; see also 250) | 10 | 24 | PT |
| 780 | Canada: Northern Alberta, north of Lacombe (see 403) | 9 | 23 | MT |
| 782 | Canada: HALIFAX (CHARLOTTETOWN) | 7 | 20 | AT |
| 807 | Canada: W Ontario: Thunder Bay | 9 | 21 | CT,ET |
| 819 | NW Quebec: Trois Rivieres (see 867) | 8 | 21 | ET |
| 825 | Canada: Alberta: (overlaid on 780 and 587; eff 04/09/16) | 9 | 23 | MT |
| 867 | Canada: Yukon, Northwest Territories, Nunavut (split from 403/819) | 11 | 21 | PT,ET |
| 873 | NW Quebec: Trois Rivieres (see 867) | 8 | 21 | ET |
| 902 | Canada: Nova Scotia, Prince Edward Island | 7 | 20 | AT |
| 905 | Canada: S Cent. Ontario: Greater Toronto Area -- Durham, Halton, Hamilton-Wentworth, Niagara, Peel, York, and southern Simcoe County (excluding Toronto -- see overlay 289 [eff 6/9/01], splits 416, 647) | 7 | 21 | ET |