---
title: "Area code 931: Tennessee, United States"
url: "https://lookvalid.com/area-code/931.md"
canonical_url: "https://lookvalid.com/area-code/931"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 931 serves Tennessee, United States. Number formats, numbering rules, a live phone validator and the other codes in Tennessee."
---

# Area code 931: Tennessee, United States

Area code 931 serves Tennessee, United States. Number formats, numbering rules, a live phone validator and the other codes in Tennessee.

NANPA lists 535 central office codes (prefixes) in use in area code 931, held by 42 holders across 100 rate centers.
South Central Bell Tel holds the most prefixes, 79 (15%). 72% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 1,391 complaints on file for 1,187 numbers in 931, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- In service since: 1997-09-15
- Time zone: EC
- Prefixes in use: 535
- Pooled prefixes: 387 (72%)
- Rate centers: 100
- Companies holding prefixes: 42
- Assignment dates on file: 2001-01-26 to 2026-07-02 (238 prefixes)
- ZIP codes in its places: 78

## Rate centers

| Rate center | Prefixes | Share |
| --- | --- | --- |
| CLARKSVL | 70 | 13% |
| COOKEVILLE | 35 | 7% |
| COLUMBIA | 31 | 6% |
| SHELBYVL | 22 | 4% |
| CROSSVILLE | 17 | 3% |
| TULLAHOMA | 17 | 3% |
| WINCHESTER | 15 | 3% |
| LAWRENCEBG | 13 | 2% |
| 92 other rate centers | 315 | 59% |

## Carriers

| Holder | Prefixes | Share |
| --- | --- | --- |
| South Central Bell Tel | 79 | 15% |
| Verizon Wireless | 72 | 13% |
| New Cingular Wireless PCS | 52 | 10% |
| Level 3 Communications | 44 | 8% |
| Powertel Nashville Licenses | 39 | 7% |
| Onvoy | 32 | 6% |
| 36 other carriers | 217 | 41% |

A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company.

## History

- 1954-01-01: Area code 615, named as the parent of 931 in the NANPA report, was in service.
- 1997-09-15: Area code 931 went into service.

## Nearest area codes

The area codes closest to 931, measured between the centers of the ZIP code places they serve, are 615 (about 37 miles), 629 (about 37 miles), 938 (about 93 miles), 256 (about 95 miles) and 270 (about 116 miles).

## ZIP codes

78 ZIP codes fall in places that have a rate center in this area code. The places with the most are Cookeville, TN (5 ZIP codes), Crossville, TN (5 ZIP codes) and Columbia, TN (2 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

1,391 complaints for 1,187 numbers. Numbers whose latest complaint falls in each year:

- 2023: 70
- 2024: 68
- 2025: 82

## Questions

### Where is area code 931?

NANPA assigns area code 931 to Tennessee, United States.

### In which state does area code 931 sit?

Tennessee. 931 is one of 8 area codes the NANPA table assigns to the state.

### Which places does area code 931 cover?

The places with the most ZIP codes among the rate centers in 931 are Cookeville, TN, Crossville, TN and Columbia, TN. The rate center list on this page shows all of them.

### Who owns area code 931?

NANPA assigns area codes. Within 931, South Central Bell Tel holds the most prefixes, 79 prefixes or 15%.

### Which time zone does 931 use?

The NANPA NPA report lists the time zone for 931 as EC.

### What year did 931 enter service?

The NANPA NPA report gives an in-service date of 1997-09-15, so 931 has been in use since 1997.

### Does area code 931 have an overlay?

The NANPA NPA report lists no other area code in an overlay with 931.

### Which area codes are nearest to 931?

The area codes closest to 931, measured between the centers of the ZIP code places they serve, are 615 (about 37 miles), 629 (about 37 miles), 938 (about 93 miles), 256 (about 95 miles) and 270 (about 116 miles).

### How many prefixes does area code 931 have?

NANPA's report dated 2026-10-17 lists 535 prefixes in service in 931, spread over 100 rate centers and 42 holders.

### Are there complaints about 931 numbers?

The FCC data on file has 1,391 complaints for 1,187 numbers in 931. They are unverified consumer reports. A number with no complaints on file is not proven safe.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).