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397 IN-SERVICE CODES
DATA 07/30/2026

878

In-service U.S. numbering code

878 Area Code

Pennsylvania · Eastern Time

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Location
Pennsylvania
Time zone
Eastern Time
In service since
17-Aug-2001
NANPA status
In service
Overlay codes
412, 724
City references
Pittsburgh
Service type
Geographic
Source date
07/30/2026

What the 878 area code means

The 878 code is assigned in Pennsylvania. It participates in an overlay complex with 412, 724, so those codes can serve the same or overlapping numbering region. A number carrying this code is not proof of the caller’s current location.

Codes in the same overlay complex

878Eastern Time412Eastern Time724Eastern Time

Data source and limitations

The status fields above come from the NANPA NPA report dated 07/30/2026. City references are curated for navigation and do not replace exchange-level carrier data. Number portability also means a person can keep a number after moving.

Open the official NANPA CSV source.

Last updated: July 23, 2026

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Data accuracy

Area-code status, state or territory, overlay relationships, service type, and in-service dates are derived from the NANPA NPA database. An area code can cover many communities, and a city label is a practical lookup aid rather than proof that a specific number or caller is physically located there.

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