Area code 507 vs 924
507 and 924 are overlay codes: they cover the same ground in Minnesota, and a number in one is a local call to the other. 507 is the original, in service since 1954. 924 was added in 2024 because the first was filling up – that is what an overlay is for. Today 507 has 766 of 786 blocks assigned (97.5%) and 924 has 0 of 786 (0.0%), so a new number in the area now almost always comes from 924. 507 appears in the complaint data with 276 complaints in the window; 924 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
| 507 | 924 | |
|---|---|---|
| In service since | 1954 | 2024 |
| Region | Minnesota | Minnesota |
| Blocks assigned | 766 of 786 (97.5%) | 0 of 786 (0%) |
| Largest block holder | Other CLEC / VoIP 27.7% | – |
| Complaints, 28 Sep – 30 Oct 2026 | 276 (#313) | not in the data |
| Rate centers | 228 | – |
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 507 and 924?
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 507 and 924?
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 507 or 924?
Whichever has blocks left – currently 924, at 0% allocated against 97.5% for the other. Carriers draw from the code with free blocks, which is why the newer code spreads over time.
Is 507 or 924 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
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, 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: 507 · 924. All codes in Minnesota: Minnesota area codes.