Indianapolis, IN — rate center

NANPA rate center & CO code data, current as of July 28, 2026.

Phone numbers "from Indianapolis" are, precisely speaking, numbers whose prefixes are anchored to the Indianapolis rate center of Indiana, under 317, 463, 765.

NANPA records show 571 active prefixes here across 38 carriers. 352 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.

The rate center belongs to the Indianapolis-Carmel-Greenwood, IN Metropolitan Statistical Area. Routing-wise it sits in LATA 336.

Multiple area codes over one rate center (317/463/765) is the overlay pattern: same geography, different first three digits.

At 571 prefixes — a ceiling of 5,710,000 numbers — Indianapolis is one of Indiana's heavyweight rate centers.

As always with US numbering: a prefix anchored to Indianapolis tells you where the block was issued. The person calling may have ported the number, moved away, or be spoofing it entirely — verify callers through independently found contact details.

Prefixes anchored to Indianapolis

FAQ

What area code is Indianapolis, IN?

Indianapolis is served by 3 area codes — 317, 463, 765 — which overlay the same territory.

How many prefixes does Indianapolis have?

571 active NXX prefixes are anchored to this rate center in NANPA records, held by 38 carriers.

Is a call from a Indianapolis prefix really from Indianapolis?

Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.