412
Area code
PA
United States geographic area code, in service since 1947-01-01. Part of the 412/878 overlay complex — ten-digit dialing required.
Statusin service
Introduced1947-01-01
JurisdictionPA, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 98.9% of assignable prefixes assigned
As of 09/17/2026
0%783 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 2001-01-22, most recent 2026-07-06.
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 | VERIZON PENNSYLVANIA, INC. | 249 | 31.8% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 86 | 11% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - IL | 60 | 7.7% |
| 04 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 57 | 7.3% |
| 05 | AERIAL COMMUNICATIONS, INC. | 49 | 6.3% |
| 06 | ONVOY, LLC - PA | 42 | 5.4% |
| 07 | PAETEC ITEL, LLC | 38 | 4.9% |
| 08 | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 35 | 4.5% |
| 09 | LEVEL 3 COMMUNICATIONS, LLC - PA | 34 | 4.3% |
| 10 | SPOK, INC. | 24 | 3.1% |
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)
- 1947-01-01Area code 412 entered service.
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) |
| 1999-11-29 | PL-198 ↗ | Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for 412 NPA (Pennsylvannia) |