Cities in area code 878

104 localities · NANPA data, current as of July 28, 2026.

These are the cities and communities covered by 878 in Pennsylvania. "Covered" means the locality is a rate center holding 878 prefixes; the largest are Pittsburgh Zone 1, Beaver Falls, Rochester.

By numbering footprint the leading localities are Pittsburgh Zone 1, Beaver Falls, Rochester, Washington, Greensburg, Criders Corners, Uniontown and Butler, and 95 smaller communities down to single-prefix localities. Prefix counts track lines in service, so the ranking is a reasonable proxy for where the code's subscribers actually are.

92 of the localities fall within FCC top-100 metropolitan statistical areas; the rest are smaller communities.

104 of these localities are also reachable through other area codes — overlay territory where the same place answers to several codes.

All of the code's territory keeps Eastern time.

Remember that people keep numbers when they relocate, so a 878 number is a where-it-was-issued fact, not a where-they-are fact.

FAQ

What is the biggest city in area code 878?

Pittsburgh Zone 1 holds the most active prefixes (9), making it the code's largest numbering locality.

How many places does 878 cover?

104 rate centers in Pennsylvania hold active 878 prefixes, from Pittsburgh Zone 1 down to communities with a single prefix.

Does a 878 number guarantee the caller lives in one of these places?

No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.