Utah area codes
Utah uses 3 area codes. The oldest is 801, in service since 1947; the newest is 385, from 2009. Across them 1,779 of 2,358 possible number blocks are allocated, 75.4% of capacity. 801 is at or past 95%, which is why new numbers there come from overlays rather than the original code. Lumen holds 25.2% of the 1,779 assigned blocks across the state, ahead of AT&T at 15.1%; a further 13.2% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named an Utah caller ID 1,635 times – 0.7% of all complaints in the window, most often 801 with 571 (183rd of 422 nationally). NANPA records 153 rate centers across the state's codes.
All 3 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 385 | 2009 | 495/786 | AT&T 23% | 566 | 801 |
| 435 | 1997 | 501/786 | Other CLEC / VoIP 27.9% | 498 | no overlay |
| 801 | 1947 | 783/786 | Lumen 43.4% | 571 | 385 |
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 Utah’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: 1,779 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Utah | Largest in |
|---|---|---|---|
| Lumen | 448 | 25.2% | 1 code |
| AT&T | 268 | 15.1% | 1 code |
| Verizon | 250 | 14.1% | – |
| Other CLEC / VoIP | 234 | 13.2% | 1 code |
| T-Mobile | 207 | 11.6% | – |
| Onvoy | 154 | 8.7% | – |
| Bandwidth | 56 | 3.1% | – |
| Allstream | 54 | 3% | – |
| Frontier | 28 | 1.6% | – |
| Comcast | 22 | 1.2% | – |
| Spok | 13 | 0.7% | – |
| Windstream | 9 | 0.5% | – |
“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 Utah codes
FTC Do Not Call complaints where the caller ID shown was a Utah 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 Utah got its codes
1 in the 1940s, 1 in the 1990s, 1 in the 2000s. Each code after the first was split off from or overlaid on one already in service.
- 1947 801 goes into service.
- 1997 435 goes into service, split from or overlaid on 801.
- 2009 385 goes into service, split from or overlaid on 801.
Time zones
Utah is in Mountain time.
Frequently asked about Utah area codes
How many area codes does Utah have?
3 in service. They are 385, 435 and 801.
What is the oldest area code in Utah?
801, 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 Utah?
385, from 2009, overlaying 801.
Is Utah running out of numbers?
801 is at or past 95% of capacity, but NANPA has not opened relief planning for it, so no new code is announced.
What time zone is Utah in?
Mountain time.
Which Utah area code gets the most spam complaints?
801 – 571 FTC complaints in the 33 days to 30 October 2026, 183rd 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 Utah numbers?
Lumen, with 25.2% of the 1,779 blocks assigned across Utah, ahead of AT&T at 15.1%. 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.