815 area code — Rockford, IL geographic

Data: NANPA public reports, current as of July 28, 2026.

Phone numbers beginning 815 are registered to the Rockford area of Illinois (Central time zone). The code entered service on January 1, 1947. It is part of the 779/815 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 815 number can be used from anywhere — the code marks where the number was assigned.

786 central-office prefixes are currently active in this code, spread across 53 code-holding carriers. Thousands-block pooling applies to 519 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 200 distinct rate centers.

If a 815 call asks for money or personal data, treat the displayed number as unverified: hang up and reach the organization through its published number. Numbering data locates numbers, not callers.

It has since spawned 779 (2007).

NANPA projects numbering capacity for the 779/815 complex to exhaust in 1Q 2044.

Dialing: 1+10D locally, 1+10D to other codes.

Largest localities in 815

FAQ

Where is a 815 number from?

815 is assigned to Rockford and surrounding areas of Illinois in the Central time zone. The three digits after the area code (the prefix) narrow it down to a rate center.

Is 815 a toll-free number?

No. 815 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 779 and 815 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 779/815 complex shares one service area, and local calls are dialed with 10 digits.

Will 815 run out of numbers?

NANPA's current forecast projects exhaust in 1Q 2044 — decades of capacity remain.