Area code 548: Ontario
Area code 548 is a Canadian province area code for Ontario, on Eastern Time. It has 502 prefixes in service across 170 exchange areas, the largest being London, Kitchener-Waterloo and Windsor. It shares its area with 226, 382 and 519, so local numbers there can start with any of them. Local calls there take 10 digits.
Local time in area code 548
America/Toronto
Prefixes in service
502 of 792 possible
170 exchange areas
Area code 548 facts
| Location | Ontario, Canada |
|---|---|
| Time zone | Eastern Time |
| Overlays | 226, 382, 519 |
| Overlay of | 226 |
| In service since | June 4, 2016 |
| 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 548?
The Canadian Numbering Administrator records each prefix against an exchange area, usually named after its main town. These are the 548 exchange areas with the most prefixes in service. 158 smaller ones aren't listed.
| Exchange area | Prefixes |
|---|---|
| London | 37 |
| Kitchener-Waterloo | 25 |
| Windsor | 20 |
| Guelph | 12 |
| Brantford | 12 |
| Sarnia | 11 |
| Listowel | 10 |
| Mount Forest | 9 |
| Leamington | 9 |
| Chatham | 8 |
| Essex | 8 |
| Owen Sound | 7 |
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 548 number?
NANPA's dialling plan for 548: 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 548 | 548-555-0147 |
|---|---|
| From another US or Canadian area code | 1-548-555-0147 |
| From outside North America | +1 548 555 0147 |
| E.164, for CRMs and SMS tools | +15485550147 |
When did area code 548 start?
Area code 548 went into service on June 4, 2016 as an overlay of 226. Today 548, 226, 382 and 519 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 548 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 548 number tells you where it was issued, not what it is now.
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Area code 548 questions
- What province is area code 548?
- Area code 548 is in Ontario, Canada. Its largest exchange areas by number of prefixes are London, Kitchener-Waterloo, Windsor, Guelph and Brantford.
- What time zone is area code 548 in?
- Eastern Time.
- What area codes overlay 548?
- 226, 382 and 519. 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 548 start?
- Area code 548 went into service on June 4, 2016 as an overlay of 226.
- Is a 548 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 548 have?
- 502 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.