Area code 431 vs 584
431 and 584 are overlay codes: they cover the same ground in Manitoba, and a number in one is a local call to the other. 431 is the original, in service since 2012. 584 was added in 2022 because the first was filling up – that is what an overlay is for. Today 431 has 584 of 800 blocks assigned (73.0%) and 584 has 35 of 800 (4.4%), so a new number in the area now almost always comes from 584. 431 appears in the complaint data with 258 complaints in the window; 584 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
| 431 | 584 | |
|---|---|---|
| In service since | 2012 | 2022 |
| Region | Manitoba | Manitoba |
| Blocks assigned | 584 of 800 (73%) | 35 of 800 (4.4%) |
| Largest block holder | Other CLEC / VoIP 28.1% | Other CLEC / VoIP 28.6% |
| Complaints, 28 Sep – 30 Oct 2026 | 258 (#318) | not in the data |
| Rate centers | 148 | 13 |
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 431 and 584?
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 431 and 584?
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 431 or 584?
Whichever has blocks left – currently 584, at 4.4% allocated against 73.0% for the other. Carriers draw from the code with free blocks, which is why the newer code spreads over time.
Is 431 or 584 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: 431 · 584. All codes in Manitoba: Manitoba area codes.