Area code 317: where it is and who calls from it
Area code 317 is in Indiana.
Indiana (Indianapolis and immediate metro area including Carmel, Fishers, Noblesville, Westfield, Greenwood, Mooresville, Beech Grove, Plainfield, Avon, Brownsburg, and Zionsville)
| Where | Indiana |
|---|---|
| Time zone | Eastern Time ยท local time |
| In service since | 1947 |
| Overlay | Yes, with 463 |
| Prefixes assigned | 786 of 792 possible (99%) |
Overlay: 317 covers the same area as 463. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 317 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 317, with how many prefixes each has.
Who holds 317 numbers
- Mobile carrier 30%
- Local phone company 41%
- Internet / business phone carrier 23%
- Paging service 4%
- Phone company 2%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| AT&T (local phone) | Local phone company | 297 | 38% |
| T-Mobile (including Sprint) | Mobile carrier | 80 | 10% |
| Verizon Wireless | Mobile carrier | 80 | 10% |
| AT&T Mobility | Mobile carrier | 65 | 8% |
| Level 3 (Lumen) | Internet / business phone carrier | 57 | 7% |
| Windstream (PAETEC) | Internet / business phone carrier | 31 | 4% |
| Teleport Communications America | Internet / business phone carrier | 25 | 3% |
| Bandwidth | Internet / business phone carrier | 22 | 3% |
| Onvoy | Internet / business phone carrier | 18 | 2% |
| Spok | Paging service | 15 | 2% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Indiana.
Other area codes in Indiana
Got a call from 317?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 317 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.