317 area code — Indianapolis, IN geographic
If a call shows area code 317, the number was issued in the Indianapolis area — a code active since 1947, on Eastern time. Together with 463 it forms the 317/463 overlay. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.
NANPA lists 784 active NXX prefixes in 317, assigned to 30 carriers. 489 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 36 rate centers (billing localities).
Official projections put exhaust for the 317/463 complex at 2Q 2058.
Later relief produced 765 (1997), 463 (2016) from its territory.
The dialing plan is 10D for home-NPA local calls and 10D across codes.
Worth noting: 317 is the oldest area code in Indiana, in service since 1947.
Practical takeaway: the 317 label narrows geography to Indiana, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.
Largest localities in 317
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Indianapolis | 509 | 463, 765 |
| Carmel | 43 | 463 |
| Fishers | 34 | 463 |
| Greenwood | 22 | 463 |
| Noblesville | 16 | 463 |
| Plainfield | 14 | 463 |
| Greenfield | 14 | 463 |
| Franklin | 12 | 463 |
| Shelbyville | 12 | 463 |
| Brownsburg | 7 | 463 |
FAQ
Where is a 317 number from?
317 is assigned to Indianapolis and surrounding areas of Indiana in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.
Is 317 a toll-free number?
No. 317 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Why do 463 and 317 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 317/463 complex shares one service area, and local calls are dialed with 10 digits.
Will 317 run out of numbers?
NANPA's current forecast projects exhaust in 2Q 2058 — decades of capacity remain.
Why am I getting spam calls from 317 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 317 number does not prove the call originated there — see our guide to spotting spoofed calls.