Wyoming area codes
Wyoming uses 1 area code. Its code 307 has been in service since 1947. It has 499 of its 786 possible number blocks allocated, 63.5% of capacity. Across the state no single national carrier holds the most blocks: 32.9% sits with CLEC and VoIP holders counted together, ahead of Lumen at 24.8%. In the 33 days to 30 October 2026, FTC complaints named a Wyoming caller ID 382 times – 0.2% of all complaints in the window, most often 307 with 382 (256th of 422 nationally). NANPA records 92 rate centers in 307.
The Wyoming area code
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 307 | 1947 | 499/786 | Other CLEC / VoIP 32.9% | 382 | no overlay |
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 Wyoming’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.
Most room left
Who holds the number blocks
Counted from every assigned block in the state: 499 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Wyoming | Largest in |
|---|---|---|---|
| Other CLEC / VoIP | 164 | 32.9% | 1 code |
| Lumen | 124 | 24.8% | – |
| Verizon | 63 | 12.6% | – |
| AT&T | 52 | 10.4% | – |
| Onvoy | 40 | 8% | – |
| Bandwidth | 19 | 3.8% | – |
| T-Mobile | 15 | 3% | – |
| Charter | 11 | 2.2% | – |
| Telnyx | 4 | 0.8% | – |
| Vonage | 3 | 0.6% | – |
| Dish | 2 | 0.4% | – |
| Comcast | 1 | 0.2% | – |
“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 Wyoming codes
FTC Do Not Call complaints where the caller ID shown was a Wyoming 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.
Time zones
Wyoming is in Mountain time.
Frequently asked about Wyoming area codes
How many area codes does Wyoming have?
1 in service. That code is 307.
What is the oldest area code in Wyoming?
307, in service since 1947.
What time zone is Wyoming in?
Mountain time.
Which Wyoming area code gets the most spam complaints?
307 – 382 FTC complaints in the 33 days to 30 October 2026, 256th 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 Wyoming numbers?
No one carrier does. 32.9% of the 499 number blocks assigned across Wyoming are held by CLEC and VoIP providers outside the national carriers – resellers and app-based numbers look like this in the records. The largest named carrier is Lumen with 24.8%. 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.