Area Code 742
Area code 742 is in Ontario, Canada , serving 155 cities, including Mississauga, Oshawa or St Catharines; it currently uses 139 prefixes, assigned from 742-200-XXXX through 742-999-XXXX.
In service since October 16, 2021, area code 742 is an overlay Numbering Plan Area, part of overlay complex 905/289/365/742.
The current local time is .
For exact NPA boundaries see official 742 area code map
More Ontario area codes:
Locate any 742-NXX prefix:
| NPANXX | Area Served1 |
|---|---|
| 742-200 | Richmond Hill |
| 742-201 | Blackstock |
| 742-202 | Bowmanville |
| 742-203 | Brooklin |
| 742-204 | Hampton |
| 742-205 | Newcastle |
| 742-206 | Port Perry |
| 742-210 | Oak Ridges |
| 742-212 | St. Catharines-Thorold |
| 742-213 | St. Catharines-Thorold |
| 742-218 | Hamilton |
| 742-219 | St. Catharines-Thorold |
| 742-222 | Brampton |
| 742-225 | Welland |
| 742-226 | Cayuga |
| 742-227 | Malton |
| 742-228 | Thornhill |
| 742-229 | Ajax-Pickering |
| 742-234 | Milton |
| 742-239 | Brampton |
| 742-240 | Caledon East |
| 742-241 | Snelgrove |
| 742-242 | Castlemore |
| 742-243 | Malton |
| 742-244 | Streetsville |
| 742-245 | Cooksville |
| 742-246 | Clarkson |
| 742-247 | Brampton |
| 742-248 | Victoria |
| 742-276 | South Pickering |
| 742-277 | Port Credit |
| 742-288 | Cobourg |
| 742-299 | Wellandport |
| NPANXX | Area Served1 |
|---|---|
| 742-300 | Streetsville |
| 742-301 | Caledon East |
| 742-302 | Castlemore |
| 742-303 | Clarkson |
| 742-312 | Stouffville |
| 742-333 | Oshawa |
| 742-350 | Cobourg |
| 742-367 | Niagara-On-The-Lake |
| 742-368 | Aurora |
| 742-369 | Bethesda |
| 742-370 | Bolton |
| 742-371 | Claremont |
| 742-372 | Gormley |
| 742-373 | Keswick |
| 742-374 | King City |
| 742-375 | Kleinburg |
| 742-376 | Maple |
| 742-377 | Markham |
| 742-378 | Mount Albert |
| 742-379 | Newmarket |
| 742-380 | Nobleton |
| 742-381 | Oak Ridges |
| 742-382 | Palgrave |
| 742-384 | Queensville |
| 742-385 | Richmond Hill |
| 742-386 | Schomberg |
| 742-387 | Stouffville |
| 742-388 | Sutton |
| 742-389 | Thornhill |
| 742-391 | Unionville |
| 742-392 | Uxbridge |
| 742-393 | Woodbridge |
| 742-399 | Freelton |
| NPANXX | Area Served1 |
|---|---|
| 742-400 | Ajax-Pickering |
| 742-401 | Burlington |
| 742-422 | Wainfleet |
| 742-442 | Pelham |
| 742-444 | Hamilton |
| 742-450 | Cobourg |
| 742-461 | Georgetown |
| 742-488 | St. Catharines-Thorold |
| NPANXX | Area Served1 |
|---|---|
| 742-500 | Niagara Falls |
| 742-532 | Streetsville |
| 742-551 | Vineland |
| 742-552 | Port Robinson |
| 742-558 | Hamilton |
| 742-583 | Cooksville |
| 742-588 | Brampton |
| 742-599 | St. Catharines-Thorold |
| NPANXX | Area Served1 |
|---|---|
| 742-600 | Whitby |
| 742-601 | St. Catharines-Thorold |
| 742-614 | Brampton |
| 742-615 | Brampton |
| 742-616 | Brampton |
| 742-666 | St. Catharines-Thorold |
| 742-688 | Brampton |
| NPANXX | Area Served1 |
|---|---|
| 742-700 | Burlington |
| 742-701 | Brampton |
| 742-724 | Cooksville |
| 742-743 | Bradford |
| 742-744 | Tottenham |
| 742-745 | Ajax-Pickering |
| 742-746 | Oshawa |
| 742-747 | South Pickering |
| 742-748 | Whitby |
| 742-770 | Niagara Falls |
| 742-771 | Markham |
| 742-772 | Newmarket |
| 742-773 | Richmond Hill |
| 742-774 | Thornhill |
| 742-775 | Woodbridge |
| 742-776 | Niagara-On-The-Lake |
| 742-777 | Markham |
| 742-778 | Brampton |
| 742-788 | Wainfleet |
| NPANXX | Area Served1 |
|---|---|
| 742-800 | Sutton |
| 742-855 | Hamilton |
| 742-877 | Fisherville |
| 742-880 | Hamilton |
| 742-881 | Port Colborne |
| 742-882 | Niagara Falls |
| 742-883 | Welland |
| 742-884 | Pelham |
| 742-885 | Georgetown |
| 742-886 | Milton |
| 742-887 | Beeton |
| 742-888 | Pelham |
| 742-889 | Wainfleet |
| 742-890 | Wellandport |
| 742-899 | Uxbridge |
| NPANXX | Area Served1 |
|---|---|
| 742-900 | Unionville |
| 742-901 | Uxbridge |
| 742-986 | Ajax-Pickering |
| 742-987 | Ajax-Pickering |
| 742-988 | Ajax-Pickering |
| 742-989 | Aurora |
| 742-990 | Bethesda |
| 742-991 | Bolton |
| 742-992 | Claremont |
| 742-993 | Gormley |
| 742-994 | Keswick |
| 742-995 | King City |
| 742-996 | Kleinburg |
| 742-997 | Maple |
| 742-998 | Mount Albert |
| 742-999 | Hamilton |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- NXX prefixes last updated: June 3, 2025
Cities in area code 742
| City1 | Time Zone1 |
|---|---|
| Ajax | E |
| Alberton | E |
| Allanburg | E |
| Alton | E |
| Ancaster | E |
| Ashburn | E |
| Aurora | E |
| Baldwin | E |
| Baltimore | E |
| Beamsville | E |
| Beeton | E |
| Belfountain | E |
| Bewdley | E |
| Binbrook | E |
| Blackstock | E |
| Bolton | E |
| Bond Head | E |
| Bowmanville | E |
| Bradford | E |
| Brampton | E |
| Brougham | E |
| Burlington | E |
| Caesarea | E |
| Caistor Centre | E |
| Caledon | E |
| Caledon East | E |
| Caledon Village | E |
| Caledonia | E |
| Campbellcroft | E |
| Campbellville | E |
| Campden | E |
| Canfield | E |
| Carlisle | E |
| Castleton | E |
| Cayuga | E |
| Cedar Valley | E |
| Cheltenham | E |
| Claremont | E |
| Cobourg | E |
| Colborne | E |
| Concord | E |
| Copetown | E |
| Courtice | E |
| Crystal Beach | E |
| Dundas | E |
| Dunnville | E |
| East Gwillimbury | E |
| Fenwick | E |
| Fisherville | E |
| Fonthill | E |
| Fort Erie | E |
| Freelton | E |
| Georgetown | E |
| Gilford | E |
| Goodwood | E |
| Gores Landing | E |
| Gormley | E |
| Grafton | E |
| Grassie | E |
| Greenbank | E |
| Greenwood | E |
| Grimsby | E |
| Hagersville | E |
| Haldimand County | E |
| Hamilton | E |
| Hampton | E |
| Hannon | E |
| Harwood | E |
| Holland Landing | E |
| Hornby | E |
| Inglewood | E |
| Innisfil | E |
| Jacksons Point | E |
| Jerseyville | E |
| Jordan Station | E |
| Kendal | E |
| Keswick | E |
| Kettleby | E |
| Kilbride | E |
| King City | E |
| Kleinburg | E |
| Leaskdale | E |
| Limehouse | E |
| Locust Hill | E |
| Loretto | E |
| Lowbanks | E |
| Lynden | E |
| Maple | E |
| Markham | E |
| Millgrove | E |
| Milton | E |
| Mississauga | E |
| Moffat | E |
| Mount Albert | E |
| Mount Hope | E |
| Nestleton Station | E |
| Newcastle | E |
| Newmarket | E |
| Newtonville | E |
| Niagara Falls | E |
| Niagara On The Lake | E |
| Nobleton | E |
| Norval | E |
| Oakville | E |
| Orono | E |
| Oshawa | E |
| Palgrave | E |
| Pickering | E |
| Port Colborne | E |
| Port Hope | E |
| Port Perry | E |
| Port Robinson | E |
| Prince Albert | E |
| Queenston | E |
| Queensville | E |
| Richmond Hill | E |
| Ridgeville | E |
| Ridgeway | E |
| River Drive Park | E |
| Roches Point | E |
| Roseneath | E |
| Sandford | E |
| Schomberg | E |
| Seagrave | E |
| Selkirk | E |
| Sharon | E |
| Sherkston | E |
| Smithville | E |
| St Anns | E |
| St Catharines | E |
| St Davids | E |
| Stevensville | E |
| Stoney Creek | E |
| Stouffville | E |
| Sutton West | E |
| Terra Cotta | E |
| Thornhill | E |
| Thorold | E |
| Tottenham | E |
| Unionville | E |
| Uxbridge | E |
| Vaughan | E |
| Vineland | E |
| Vineland Station | E |
| Virgil | E |
| Wainfleet | E |
| Waterdown | E |
| Welland | E |
| Wellandport | E |
| West Flamborough | E |
| Whitby | E |
| Whitevale | E |
| Willow Beach | E |
| Woodbridge | E |
| Zephyr | E |
- Listed above are most places served by Canadian area code 742. When multiple places in a CA province share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- E stands for Eastern Time (currently ).