Missouri area codes
Missouri uses 9 area codes. The oldest is 314, in service since 1947; the newest is 235, from 2024. Across them 4,173 of 7,074 possible number blocks are allocated, 59.0% of capacity. 573, 816 and 314 are at or past 95%, which is why new numbers there come from overlays rather than the original code. AT&T holds 34.0% of the 4,173 assigned blocks across the state, ahead of Verizon at 9.4%; a further 12.1% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named a Missouri caller ID 4,269 times – 1.9% of all complaints in the window, most often 314 with 1,251 (16th of 422 nationally). NANPA records 767 rate centers across the state's codes.
All 9 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 235 | 2024 | 41/786 | AT&T 39% | 33 | 573 |
| 314 | 1947 | 783/786 | AT&T 49.7% | 1,251 | 557 |
| 417 | 1950 | 711/786 | AT&T 22.9% | 659 | no overlay |
| 557 | 2022 | 84/786 | AT&T 45.2% | 24 | 314 |
| 573 | 1996 | 786/786 | AT&T 32.3% | 849 | 235 |
| 636 | 1999 | 435/786 | AT&T 36.3% | 367 | no overlay |
| 660 | 1997 | 518/786 | Other CLEC / VoIP 32.2% | 295 | no overlay |
| 816 | 1947 | 785/786 | AT&T 40.3% | 783 | 975 |
| 975 | 2023 | 30/786 | Onvoy 53.3% | 8 | 816 |
Block share is share of allocated number blocks, not of subscribers. Complaint counts cover 28 Sep – 30 Oct 2026 and reflect spoofed caller IDs as much as real calls.
How full Missouri’s codes are
A code holds at most 786 blocks of 10,000 numbers each. When a code fills up, the administrator does not reclaim numbers – it adds an overlay, and from then on new numbers in the same area come from the new code.
Full or nearly full
Who holds the number blocks
Counted from every assigned block in the state: 4,173 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Missouri | Largest in |
|---|---|---|---|
| AT&T | 1,420 | 34% | 7 codes |
| Other CLEC / VoIP | 505 | 12.1% | 1 code |
| Verizon | 393 | 9.4% | – |
| Lumen | 378 | 9.1% | – |
| Onvoy | 367 | 8.8% | 1 code |
| T-Mobile | 344 | 8.2% | – |
| Brightspeed | 294 | 7% | – |
| Windstream | 178 | 4.3% | – |
| Charter | 76 | 1.8% | – |
| Bandwidth | 70 | 1.7% | – |
| Peerless | 30 | 0.7% | – |
| Spok | 25 | 0.6% | – |
“Other CLEC / VoIP” is not one company: it is every holder outside the national carriers counted together, which is what resellers and app-based numbers look like in the records. This is allocation, not subscribers.
Spam complaints naming Missouri codes
FTC Do Not Call complaints where the caller ID shown was a Missouri number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are routinely faked, so these are complaints about the code, not calls proven to come from it.
How Missouri got its codes
2 in the 1940s, 1 in the 1950s, 3 in the 1990s, 3 in the 2020s. Each code after the first was split off from or overlaid on one already in service.
- 1947 314 goes into service.
- 1947 816 goes into service.
- 1950 417 goes into service.
- 1996 573 goes into service, split from or overlaid on 314.
- 1997 660 goes into service, split from or overlaid on 816.
- 1999 636 goes into service, split from or overlaid on 314.
- 2022 557 goes into service, split from or overlaid on 314.
- 2023 975 goes into service, split from or overlaid on 816.
- 2024 235 goes into service, split from or overlaid on 573.
Time zones
Missouri is in Central time.
Frequently asked about Missouri area codes
How many area codes does Missouri have?
9 in service. They are 235, 314, 417, 557, 573, 636, 660, 816 and 975.
What is the oldest area code in Missouri?
314, in service since 1947. Every later code in the state was split off from or overlaid on an existing one.
What is the newest area code in Missouri?
235, from 2024, overlaying 573.
Is Missouri running out of numbers?
573, 816 and 314 are at or past 95% of capacity, but NANPA has not opened relief planning for them, so no new code is announced.
What time zone is Missouri in?
Central time.
Which Missouri area code gets the most spam complaints?
314 – 1,251 FTC complaints in the 33 days to 30 October 2026, 16th of 422 codes nationally. Those are complaints about the caller ID shown, and spam callers routinely fake a local-looking number, so this says the code is imitated often, not that the calls come from there.
Which carrier holds the most Missouri numbers?
AT&T, with 34.0% of the 4,173 blocks assigned across Missouri, ahead of Other CLEC / VoIP at 12.1%. This is allocation of blocks by the numbering administrator, not a count of subscribers – people keep their numbers when they switch carriers.
Sources and verification
- 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
Figures on this page are counted from those files, not copied from other sites. Spotted an error? Request a correction. How we collect and check: methodology.