Area code
817
817 is a United States area code. Under the North American Numbering Plan it belongs to Texas, which has 29 area codes in total.
Validate a number in 817
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 817 at a glance
NANPA lists 780 central office codes (prefixes) in use in area code 817, held by 34 holders across 26 rate centers.
| Fact | Value |
|---|---|
| In service since | 1953-01-01 |
| Time zone | Central (C) |
| Assigned overlays | 682 (2000-10-07) |
| Prefixes in use | 780 |
| Pooled prefixes | 466 (60%) |
| Rate centers | 26 |
| Companies holding prefixes | 34 |
| Assignment dates on file | 2001-01-16 to 2026-03-02 (122 prefixes) |
| ZIP codes in its places | 107 |
Rate centers in area code 817
| Rate center | Prefixes | Share |
|---|---|---|
| ARLINGTON | 228 | 29% |
| FORT WORTH | 192 | 25% |
| GLENDALE | 64 | 8% |
| EULESS | 47 | 6% |
| GRAPEVINE | 36 | 5% |
| NRICHLDHLS | 33 | 4% |
| ROANOKE | 22 | 3% |
| WEATHERFD | 21 | 3% |
| 18 other rate centers | 137 | 18% |
Who holds the prefixes in 817
Southwestern Bell holds the most prefixes, 300 (38%). 60% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Southwestern Bell | 300 | 38% |
| New Cingular Wireless PCS | 88 | 11% |
| T-Mobile USA | 54 | 7% |
| Level 3 Communications | 45 | 6% |
| Onvoy | 43 | 6% |
| Mcimetro Access Transmission Services | 30 | 4% |
| 28 other carriers | 220 | 28% |
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. Find which carrier a number is on, or browse the prefix holders.
History of area code 817
- 1953-01-01 Area code 817 went into service.
- 1997-05-25 Area code 254 went into service and names 817 as its parent.
- 1997-05-25 Area code 940 went into service and names 817 as its parent.
- 2000-10-07 Area code 682 went into service as an overlay in the same area as 817.
Area codes nearest to 817
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
ZIP codes in area code 817
107 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Fort Worth, TX | 56 |
| Arlington, TX | 19 |
| Denton, TX | 10 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 817 numbers
5,004 FCC complaints are on file for 3,977 numbers in 817, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 240 |
| 2024 | 164 |
| 2025 | 144 |
Other area codes in Texas
Texas is one state with 29 area codes in the NANPA table. 817 is one of them.
Next to 817 in the numbering table
These are the codes just before and after 817 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 817 was first assigned in Texas. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Texas next to a 817 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 817
Where is area code 817?
NANPA assigns area code 817 to Texas, United States.
In which state does area code 817 sit?
Texas. 817 is one of 29 area codes the NANPA table assigns to the state.
Which places does area code 817 cover?
The places with the most ZIP codes among the rate centers in 817 are Fort Worth, TX, Arlington, TX and Denton, TX. The rate center list on this page shows all of them.
Who owns area code 817?
NANPA assigns area codes. Within 817, Southwestern Bell holds the most prefixes, 300 prefixes or 38%.
Which time zone does 817 use?
The NANPA NPA report lists the time zone for 817 as Central (C).
What year did 817 enter service?
The NANPA NPA report gives an in-service date of 1953-01-01, so 817 has been in use since 1953.
Does area code 817 have an overlay?
Yes. 682 (in service 2000-10-07) shares the same area with 817, so numbers from all of them are local to each other.
Which area codes are nearest to 817?
The area codes closest to 817, measured between the centers of the ZIP code places they serve, are 214 (about 29 miles), 469 (about 30 miles), 945 (about 30 miles), 972 (about 30 miles) and 940 (about 71 miles).
How many prefixes does area code 817 have?
NANPA's report dated 2026-10-17 lists 780 prefixes in service in 817, spread over 26 rate centers and 34 holders.
Are there complaints about 817 numbers?
The FCC data on file has 5,004 complaints for 3,977 numbers in 817. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.