Area code
878
878 is a United States area code. Under the North American Numbering Plan it belongs to Pennsylvania, which has 15 area codes in total.
Validate a number in 878
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 878 at a glance
NANPA lists 190 central office codes (prefixes) in use in area code 878, held by 36 holders across 104 rate centers.
| Fact | Value |
|---|---|
| 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 in area code 878
| 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% |
Who holds the prefixes in 878
Onvoy holds the most prefixes, 51 (27%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| 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. Find which carrier a number is on, or browse the prefix holders.
History of area code 878
- 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.
Area codes nearest to 878
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
- 412 1947-01-01
- 878, 724
ZIP codes in area code 878
72 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| New Castle, PA | 6 |
| Butler, PA | 3 |
| Greensburg, PA | 3 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 878 numbers
449 FCC complaints are on file for 352 numbers in 878, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 19 |
| 2024 | 45 |
| 2025 | 21 |
Other area codes in Pennsylvania
Pennsylvania is one state with 15 area codes in the NANPA table. 878 is one of them.
Next to 878 in the numbering table
These are the codes just before and after 878 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 878 was first assigned in Pennsylvania. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Pennsylvania next to a 878 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 878
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.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.