Area Code 878

About Area Code 878

Area code 878 is a geographic telephone area code assigned to Pittsburgh, Pennsylvania. It operates in the Eastern time zone and was first introduced in 2001. Overlay for 412/724. Western Pennsylvania.

Within Pennsylvania, area code 878 shares numbering capacity with 12 other area codes. The state's 12,964,056-person population (2023 Census Bureau estimate) is served by a combined 13 active codes, with 878 primarily responsible for the Pittsburgh region. Pennsylvania's state capital is Harrisburg, and its largest city is Philadelphia.

When you receive a call from a 878 number on your Caller ID, the call originated from a phone number assigned to the 878 area code — but be aware that Local Number Portability (in effect since 2003) means the caller could be physically located anywhere in the US or Canada. Area code 878 only confirms where the number was originally assigned.

Where is the 878 area code located?

Area code 878 is assigned to Pittsburgh, Pennsylvania, in the Eastern time zone. The state of Pennsylvania uses 13 active area codes, and 878 is one of them. Calls placed from the 878 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 878 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Eastern time zone observes Daylight Saving Time, shifting from UTC-5 to UTC-4 in summer. The local time shown above is always current, so you can quickly check whether it's a reasonable hour to call back.

What cities and counties use the 878 area code?

The 878 area code serves 10 notable cities, listed below in order of population. The largest city in the 878 territory is Pittsburgh (302,971 residents in Allegheny County).

• Pittsburgh, PA — 302,971 residents (12.2% of 878 numbers)
• Philadelphia, PA — 1,567,442 residents (62.9% of 878 numbers)
• Allentown, PA — 125,845 residents (5.1% of 878 numbers)
• Erie, PA — 93,928 residents (3.8% of 878 numbers)
• Reading, PA — 95,112 residents (3.8% of 878 numbers)
• Scranton, PA — 75,799 residents (3% of 878 numbers)
• Bethlehem, PA — 76,568 residents (3.1% of 878 numbers)
• Lancaster, PA — 58,039 residents (2.3% of 878 numbers)
• Harrisburg, PA — 50,118 residents (2% of 878 numbers)
• York, PA — 44,800 residents (1.8% of 878 numbers)

Phone number format in area code 878

All phone numbers within area code 878 follow the standard North American 10-digit format:(878) NXX-XXXX. The NXX is the central office prefix (also called an "exchange") and XXXX is the subscriber line number. For long-distance calls within the NANP, dial 1 + 878 + NXX + XXXX. From outside North America, dial your country's international access code, then 1 (the NANP country code), then the 10-digit number.

If you need to verify whether a specific 878 number is wireless, landline, or VoIP, you can use our reverse phone lookup tool. Be aware that number portability means the area code no longer guarantees the caller's physical location — only where the number was first assigned.

History of area code 878

Overlay for 412/724. Western Pennsylvania.

The original 86 area codes were assigned by AT&T and Bell Labs in 1947 as part of the North American Numbering Plan. At the time, rotary-dial phones meant codes with lower digits (like 212 for NYC, 213 for LA, 312 for Chicago) were given to the largest cities because they took less time to dial. Today's area code assignments still reflect those early choices, even though touch-tone and cell phones made the original reason obsolete.

Is the 878 area code safe to answer?

Area code 878 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 878 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.