--- title: "Area code 878: Pennsylvania, United States" url: "https://lookvalid.com/area-code/878.md" canonical_url: "https://lookvalid.com/area-code/878" last_updated: "2026-10-23" type: "reference" summary: "Area code 878 serves Pennsylvania, United States. Number formats, numbering rules, a live phone validator and the other codes in Pennsylvania." --- # Area code 878: Pennsylvania, United States Area code 878 serves Pennsylvania, United States. Number formats, numbering rules, a live phone validator and the other codes in Pennsylvania. NANPA lists 190 central office codes (prefixes) in use in area code 878, held by 36 holders across 104 rate centers. Onvoy holds the most prefixes, 51 (27%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 449 complaints on file for 352 numbers in 878, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - In service since: 2001-08-17 - Time zone: Eastern (E) - Assigned overlays: 412 (1947-01-01), 878, 724 - Prefixes in use: 190 - Pooled prefixes: 190 (100%) - Rate centers: 104 - Companies holding prefixes: 36 - Assignment dates on file: 2013-04-17 to 2026-05-14 (177 prefixes) - ZIP codes in its places: 72 ## Rate centers | Rate center | Prefixes | Share | | --- | --- | --- | | BEAVER FLS | 9 | 5% | | PTTSBGZON1 | 9 | 5% | | WASHINGTON | 8 | 4% | | GREENSBURG | 7 | 4% | | ROCHESTER | 7 | 4% | | CRIDERSCOR | 6 | 3% | | UNIONTOWN | 6 | 3% | | BUTLER | 4 | 2% | | 96 other rate centers | 134 | 71% | ## Carriers | Holder | Prefixes | Share | | --- | --- | --- | | Onvoy | 51 | 27% | | Ton80 Communications | 19 | 10% | | Aerial Communications | 14 | 7% | | Onvoy Spectrum | 14 | 7% | | Fractel | 11 | 6% | | Comcast IP Phone | 7 | 4% | | 30 other carriers | 74 | 39% | A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. ## History - 1947-01-01: Area code 412, named as the parent of 878 in the NANPA report, was in service. - 2001-08-17: Area code 878 went into service. ## Nearest area codes The area codes closest to 878, measured between the centers of the ZIP code places they serve, are 724 (about 2 miles), 582 (about 63 miles), 814 (about 64 miles), 234 (about 83 miles) and 330 (about 83 miles). ## ZIP codes 72 ZIP codes fall in places that have a rate center in this area code. The places with the most are New Castle, PA (6 ZIP codes), Butler, PA (3 ZIP codes) and Greensburg, PA (3 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes. ## Complaints on file 449 complaints for 352 numbers. Numbers whose latest complaint falls in each year: - 2023: 19 - 2024: 45 - 2025: 21 ## Questions ### Where is area code 878? NANPA assigns area code 878 to Pennsylvania, United States. ### In which state does area code 878 sit? Pennsylvania. 878 is one of 15 area codes the NANPA table assigns to the state. ### Which places does area code 878 cover? The places with the most ZIP codes among the rate centers in 878 are New Castle, PA, Butler, PA and Greensburg, PA. The rate center list on this page shows all of them. ### Who owns area code 878? NANPA assigns area codes. Within 878, Onvoy holds the most prefixes, 51 prefixes or 27%. ### Which time zone does 878 use? The NANPA NPA report lists the time zone for 878 as Eastern (E). ### What year did 878 enter service? The NANPA NPA report gives an in-service date of 2001-08-17, so 878 has been in use since 2001. ### Does area code 878 have an overlay? Yes. 412 (in service 1947-01-01) and 878, 724 share the same area with 878, so numbers from all of them are local to each other. ### Which area codes are nearest to 878? The area codes closest to 878, measured between the centers of the ZIP code places they serve, are 724 (about 2 miles), 582 (about 63 miles), 814 (about 64 miles), 234 (about 83 miles) and 330 (about 83 miles). ### How many prefixes does area code 878 have? NANPA's report dated 2026-10-17 lists 190 prefixes in service in 878, spread over 104 rate centers and 36 holders. ### Are there complaints about 878 numbers? The FCC data on file has 449 complaints for 352 numbers in 878. They are unverified consumer reports. A number with no complaints on file is not proven safe. Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).