878 area code — Pittsburgh, PA geographic

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

If a call shows area code 878, the number was issued in the Pittsburgh area — a code active since 2001, on Eastern time. Together with 412 it forms the 412/878 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 187 active NXX prefixes in 878, assigned to 36 carriers. 187 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 104 rate centers (billing localities).

Official projections put exhaust for the 724/878 complex at 2Q 2072.

Its parent code is 412, which it left in 2001.

The dialing plan is 10D for home-NPA local calls and (see note) across codes.

Use this page to decode where 878 numbers come from — and remember that spoofing means the screen can lie about everything except your own caution.

Largest localities in 878

FAQ

Where is a 878 number from?

878 is assigned to Pittsburgh and surrounding areas of Pennsylvania in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.

Is 878 a toll-free number?

No. 878 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 412 and 878 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 412/878 complex shares one service area, and local calls are dialed with 10 digits.

Will 878 run out of numbers?

NANPA's current forecast projects exhaust in 2Q 2072 — decades of capacity remain.