Area code 236 vs 257
236 and 257 are overlay codes: they cover the same ground in British Columbia, and a number in one is a local call to the other. 236 is the original, in service since 2013. 257 was added in 2025 because the first was filling up – that is what an overlay is for. Today 236 has 746 of 800 blocks assigned (93.2%) and 257 has 21 of 800 (2.6%), so a new number in the area now almost always comes from 257. 236 appears in the complaint data with 532 complaints in the window; 257 does not appear at all, which is what you would expect of a code that is barely used so far. Neither code is better or safer than the other. They are the same geography, the same carriers and the same dialing rules; the difference is only how long each has existed and how full it is.
Side by side
| 236 | 257 | |
|---|---|---|
| In service since | 2013 | 2025 |
| Region | British Columbia | British Columbia |
| Blocks assigned | 746 of 800 (93.2%) | 21 of 800 (2.6%) |
| Largest block holder | Other CLEC / VoIP 32.7% | Other CLEC / VoIP 33.3% |
| Complaints, 28 Sep – 30 Oct 2026 | 532 (#200) | not in the data |
| Rate centers | 269 | 16 |
Block share is allocation by the numbering administrator, not subscribers. Complaint counts cover 28 Sep – 30 Oct 2026 and measure how often each code is spoofed on caller ID.
Frequently asked
What is the difference between area codes 236 and 257?
None geographically – they overlay the same area, so the difference is age and how many numbers are left.
Do I need to dial the area code between 236 and 257?
Yes. Overlay areas use ten-digit dialing for local calls, including between the two codes. Seven digits reaches a recording.
Will a new number be 236 or 257?
Whichever has blocks left – currently 257, at 2.6% allocated against 93.2% for the other. Carriers draw from the code with free blocks, which is why the newer code spreads over time.
Is 236 or 257 more likely to be a spam call?
The data does not support a comparison: only one of the two appears in the complaint window.
Sources
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- Canadian Numbering Administrator – CO Code Status, data date 2026-10-31, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
Each code on its own: 236 · 257. All codes in British Columbia: British Columbia area codes.