878
Area code
PA
United States geographic area code, in service since 2001-08-17. Part of the 412/878, 724/878 overlay complex — ten-digit dialing required.
Split from 412.
Statusin service
Introduced2001-08-17
JurisdictionPA, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 25.8% of assignable prefixes assigned
As of 09/17/2026
0%204 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2013-04-17, most recent 2026-05-14.
Area codes serve rate-center geographies, not municipal boundaries. “PA” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | ONVOY, LLC - PA | 51 | 25% |
| 02 | TON80 COMMUNICATIONS, LLC | 19 | 9.3% |
| 03 | ONVOY SPECTRUM, LLC | 14 | 6.9% |
| 04 | AERIAL COMMUNICATIONS, INC. | 14 | 6.9% |
| 05 | FRACTEL, LLC | 11 | 5.4% |
| 06 | MULTIPLE OCN LISTING | 10 | 4.9% |
| 07 | COMMIO, LLC | 7 | 3.4% |
| 08 | COMCAST IP PHONE, LLC | 7 | 3.4% |
| 09 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 7 | 3.4% |
| 10 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6 | 2.9% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 2000-03-14 NPA 878 to Overlay NPAs 412 and 724 (Pennsylvania)
- 2001-08-17Area code 878 entered service (created from 412).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2001-05-14 | PL-281 ↗ | Rationing in NPAs 412, 724, and 878 (Pennsylvania) |
| 2000-03-14 | PL-222 ↗ | NPA 878 to Overlay NPAs 412 and 724 (Pennsylvania) |