Tennessee area codes
Tennessee uses 8 area codes. The oldest is 901, in service since 1947; the newest is 729, from 2025. Across them 3,797 of 6,288 possible number blocks are allocated, 60.4% of capacity. 615 and 423 are at or past 95%, which is why new numbers there come from overlays rather than the original code. AT&T holds 35.7% of the 3,797 assigned blocks across the state, ahead of Verizon at 12.6%; a further 12.4% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named a Tennessee caller ID 5,364 times – 2.4% of all complaints in the window, most often 423 with 1,346 (12th of 422 nationally). The state spans 2 time zones (Eastern and Central); 423, 729 and 931 cross a zone boundary alone. NANPA records 386 rate centers across the state's codes.
All 8 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 423 | 1995 | 764/786 | AT&T 28.1% | 1,346 | 729 |
| 615 | 1954 | 781/786 | AT&T 43% | 1,034 | 629 |
| 629 | 2015 | 197/786 | Other CLEC / VoIP 25.4% | 192 | 615 |
| 729 | 2025 | 0/786 | – | – | 423 |
| 731 | 2001 | 395/786 | AT&T 35.9% | 422 | no overlay |
| 865 | 1999 | 506/786 | AT&T 40.3% | 797 | no overlay |
| 901 | 1947 | 616/786 | AT&T 45.6% | 919 | no overlay |
| 931 | 1997 | 538/786 | AT&T 25.7% | 654 | 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 Tennessee’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
729 is in service with no blocks assigned at all, so nobody can hold a number there yet – a caller ID showing one is necessarily spoofed.
Who holds the number blocks
Counted from every assigned block in the state: 3,797 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Tennessee | Largest in |
|---|---|---|---|
| AT&T | 1,355 | 35.7% | 6 codes |
| Verizon | 478 | 12.6% | – |
| Other CLEC / VoIP | 470 | 12.4% | 1 code |
| T-Mobile | 323 | 8.5% | – |
| Lumen | 316 | 8.3% | – |
| Onvoy | 260 | 6.8% | – |
| Windstream | 203 | 5.3% | – |
| Bandwidth | 97 | 2.6% | – |
| Charter | 96 | 2.5% | – |
| Spok | 49 | 1.3% | – |
| Comcast | 43 | 1.1% | – |
| Frontier | 36 | 0.9% | – |
“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 Tennessee codes
FTC Do Not Call complaints where the caller ID shown was a Tennessee 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 Tennessee got its codes
1 in the 1940s, 1 in the 1950s, 3 in the 1990s, 1 in the 2000s, 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 901 goes into service.
- 1954 615 goes into service.
- 1995 423 goes into service, split from or overlaid on 615.
- 1997 931 goes into service, split from or overlaid on 615.
- 1999 865 goes into service, split from or overlaid on 423.
- 2001 731 goes into service, split from or overlaid on 901.
- 2015 629 goes into service, split from or overlaid on 615.
- 2025 729 goes into service, split from or overlaid on 423.
Time zones
Tennessee is in Eastern, Central time. 423, 729, 931 cover more than one zone within a single area code, so the code alone does not tell you what time it is there. This code spans 2 time zones.
Frequently asked about Tennessee area codes
How many area codes does Tennessee have?
8 in service. They are 423, 615, 629, 729, 731, 865, 901 and 931.
What is the oldest area code in Tennessee?
901, 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 Tennessee?
729, from 2025, overlaying 423.
Is Tennessee running out of numbers?
615 and 423 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 Tennessee in?
It spans 2: Eastern and Central. 423, 729 and 931 cover more than one zone within a single area code, so the code alone does not tell you the time.
Which Tennessee area code gets the most spam complaints?
423 – 1,346 FTC complaints in the 33 days to 30 October 2026, 12th 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 Tennessee numbers?
AT&T, with 35.7% of the 3,797 blocks assigned across Tennessee, ahead of Verizon at 12.6%. 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.