Find the time zone, city, state, and DST status for 274 US & Canadian area codes.
These area codes have the highest search volume in North America.
The North American Numbering Plan Administration (NANPA) assigns area codes to geographic regions across the US, Canada, and Caribbean territories. The system started in 1947 with 86 original area codes.
Each area code maps to a specific geographic region with a known time zone. North America spans 8 time zones from Newfoundland (UTC-3:30) to Hawaii (UTC-10), plus areas that don't observe DST.
When a region runs out of phone numbers, NANPA either overlays a new code on the same area (e.g., 332 over 212 in Manhattan) or splits the region into two codes. Overlays require 10-digit dialing.
Since 2003, you can keep your phone number when moving. This means a 212 (Manhattan) number might belong to someone in California. Area codes indicate where a number was issued, not necessarily where the owner lives.
Quick reference for all North American time zones and their area codes.
| Time Zone | UTC Offset | DST | Area Codes |
|---|---|---|---|
| HST | UTC-10 | No | 1 codes |
| AKST/AKDT | UTC-9 | Yes (UTC-8) | 1 codes |
| PST/PDT | UTC-8 | Yes (UTC-7) | 31 codes |
| MST/MDT | UTC-7 | Yes (UTC-6) | 14 codes |
| MST | UTC-7 | No | 5 codes |
| CST/CDT | UTC-6 | Yes (UTC-5) | 83 codes |
| CST | UTC-6 | No | 1 codes |
| EST/EDT | UTC-5 | Yes (UTC-4) | 135 codes |
| AST/ADT | UTC-4 | Yes (UTC-3) | 2 codes |
| NST/NDT | UTC-3:30 | Yes (UTC-2:30) | 1 codes |
Area code data sourced from NANPA. Timezone data from IANA Time Zone Database. Last updated March 2026.