Area code 742: Ontario
Area code 742 is a Canadian province area code for Ontario, on Eastern Time. It has 148 prefixes in service across 68 exchange areas, the largest being Brampton, St. Catharines-Thorold and Hamilton. It shares its area with 289, 365 and 905, so local numbers there can start with any of them. Local calls there take 10 digits.
Local time in area code 742
America/Toronto
Prefixes in service
148 of 792 possible
68 exchange areas
Area code 742 facts
| Location | Ontario, Canada |
|---|---|
| Time zone | Eastern Time |
| Overlays | 289, 365, 905 |
| Overlay of | 905 |
| In service since | October 16, 2021 |
| Local calls | 10 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 742?
The Canadian Numbering Administrator records each prefix against an exchange area, usually named after its main town. These are the 742 exchange areas with the most prefixes in service. 56 smaller ones aren't listed.
| Exchange area | Prefixes |
|---|---|
| Brampton | 11 |
| St. Catharines-Thorold | 8 |
| Hamilton | 8 |
| Ajax-Pickering | 6 |
| Markham | 4 |
| Richmond Hill | 3 |
| Thornhill | 3 |
| Streetsville | 3 |
| Cooksville | 3 |
| Newmarket | 3 |
| Cobourg | 3 |
| Uxbridge | 3 |
Source: Canadian Numbering Administrator CO code status, file dated 2026-10-16. Each prefix holds up to 10,000 numbers.
How do I dial a 742 number?
NANPA's dialling plan for 742: local calls inside the code take 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 742 | 742-555-0147 |
|---|---|
| From another US or Canadian area code | 1-742-555-0147 |
| From outside North America | +1 742 555 0147 |
| E.164, for CRMs and SMS tools | +17425550147 |
When did area code 742 start?
Area code 742 went into service on October 16, 2021 as an overlay of 905. Today 742, 289, 365 and 905 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 742 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 742 number tells you where it was issued, not what it is now.
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Area code 742 questions
- What province is area code 742?
- Area code 742 is in Ontario, Canada. Its largest exchange areas by number of prefixes are Brampton, St. Catharines-Thorold, Hamilton, Ajax-Pickering and Markham.
- What time zone is area code 742 in?
- Eastern Time.
- What area codes overlay 742?
- 289, 365 and 905. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 742 start?
- Area code 742 went into service on October 16, 2021 as an overlay of 905.
- Is a 742 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 742 have?
- 148 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in Ontario
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and exchange areas: Canadian Numbering Administrator CO code status, 2026-10-16. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.