Oklahoma area codes
Oklahoma uses 5 area codes. The oldest is 405, in service since 1947; the newest is 572, from 2021. Across them 2,663 of 3,930 possible number blocks are allocated, 67.8% of capacity. 405 and 918 are at or past 95%, which is why new numbers there come from overlays rather than the original code. AT&T holds 36.0% of the 2,663 assigned blocks across the state, ahead of T-Mobile at 8.4%; a further 23.8% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named an Oklahoma caller ID 3,247 times – 1.4% of all complaints in the window, most often 405 with 1,694 (5th of 422 nationally). NANPA has relief planning under way for 580, so another code is coming. NANPA records 698 rate centers across the state's codes.
All 5 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 405 | 1947 | 783/786 | AT&T 44.6% | 1,694 | 572 |
| 539 | 2011 | 240/786 | Other CLEC / VoIP 32.5% | 147 | 918 |
| 572 | 2021 | 117/786 | Other CLEC / VoIP 53% | 292 | 405 |
| 580 overlay coming | 1997 | 741/786 | Other CLEC / VoIP 35.1% | 366 | no overlay |
| 918 | 1953 | 782/786 | AT&T 42.7% | 748 | 539 |
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 Oklahoma’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: 2,663 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Oklahoma | Largest in |
|---|---|---|---|
| AT&T | 958 | 36% | 2 codes |
| Other CLEC / VoIP | 634 | 23.8% | 3 codes |
| T-Mobile | 223 | 8.4% | – |
| Onvoy | 187 | 7% | – |
| Verizon | 172 | 6.5% | – |
| Windstream | 147 | 5.5% | – |
| Lumen | 129 | 4.8% | – |
| Comcast | 70 | 2.6% | – |
| Bandwidth | 52 | 2% | – |
| Charter | 25 | 0.9% | – |
| Spok | 18 | 0.7% | – |
| Peerless | 16 | 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 Oklahoma codes
FTC Do Not Call complaints where the caller ID shown was a Oklahoma 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.
| Code | Complaints | National rank |
|---|---|---|
| 405 | 1,694 | #5 of 422 |
| 918 | 748 | #122 of 422 |
| 580 | 366 | #266 of 422 |
| 572 | 292 | #308 of 422 |
| 539 | 147 | #358 of 422 |
What people said the calls were about
- Dropped call or no message – 759
- Other – 326
- Calls pretending to be government, businesses, or family and friends – 264
Topics as the complainant chose them, for the codes where the FTC published a topic.
What is coming next
NANPA has relief planning open for 580 – the step that comes before a new overlay is announced. Watch this code if you need to know whether dialing or new-number availability is about to change.
How Oklahoma got its codes
1 in the 1940s, 1 in the 1950s, 1 in the 1990s, 1 in the 2010s, 1 in the 2020s. Each code after the first was split off from or overlaid on one already in service.
- 1947 405 goes into service.
- 1953 918 goes into service.
- 1997 580 goes into service, split from or overlaid on 405.
- 2011 539 goes into service, split from or overlaid on 918.
- 2021 572 goes into service, split from or overlaid on 405.
Time zones
Oklahoma is in Central time.
Frequently asked about Oklahoma area codes
How many area codes does Oklahoma have?
5 in service. They are 405, 539, 572, 580 and 918.
What is the oldest area code in Oklahoma?
405, 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 Oklahoma?
572, from 2021, overlaying 405.
Is Oklahoma getting a new area code?
Probably. No new code is assigned yet, but NANPA lists relief planning under way for 580, which is the step before a new overlay is announced.
What time zone is Oklahoma in?
Central time.
Which Oklahoma area code gets the most spam complaints?
405 – 1,694 FTC complaints in the 33 days to 30 October 2026, 5th 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 Oklahoma numbers?
AT&T, with 36.0% of the 2,663 blocks assigned across Oklahoma, ahead of Other CLEC / VoIP at 23.8%. 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.