Area code 436 vs 440
436 and 440 are overlay codes: they cover the same ground in Ohio, and a number in one is a local call to the other. 440 is the original, in service since 1997. 436 was added in 2024 because the first was filling up – that is what an overlay is for. Today 436 has 0 of 786 blocks assigned (0.0%) and 440 has 757 of 786 (96.3%), so a new number in the area now almost always comes from 436. 440 appears in the complaint data with 879 complaints in the window; 436 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
| 436 | 440 | |
|---|---|---|
| In service since | 2024 | 1997 |
| Region | Ohio | Ohio |
| Blocks assigned | 0 of 786 (0%) | 757 of 786 (96.3%) |
| Largest block holder | – | AT&T 26.8% |
| Complaints, 28 Sep – 30 Oct 2026 | not in the data | 879 (#71) |
| Rate centers | – | 62 |
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 436 and 440?
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 436 and 440?
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 436 or 440?
Whichever has blocks left – currently 436, at 0% allocated against 96.3% for the other. Carriers draw from the code with free blocks, which is why the newer code spreads over time.
Is 436 or 440 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: 436 · 440. All codes in Ohio: Ohio area codes.