610
Area code
PA
United States geographic area code, in service since 1994-01-08. Part of the 484/610/835 overlay complex — ten-digit dialing required.
Statusin service
Introduced1994-01-08
JurisdictionPA, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 101% of assignable prefixes assigned
As of 09/17/2026
0%800 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 2001-03-08, most recent 2026-02-17.
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. | 325 | 40.6% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - DC | 56 | 7% |
| 03 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 43 | 5.4% |
| 04 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 39 | 4.9% |
| 05 | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 38 | 4.8% |
| 06 | LEVEL 3 COMMUNICATIONS, LLC - PA | 36 | 4.5% |
| 07 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 35 | 4.4% |
| 08 | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 29 | 3.6% |
| 09 | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 21 | 2.6% |
| 10 | PAETEC ITEL, LLC | 20 | 2.5% |
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- 1994-01-08Area code 610 entered service (created from 215).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2022-01-13 | PL-578 ↗ | NPA 835 to Overlay NPA 484/610 (Pennsylvania) |
| 1993-01-05 | IL-93-01-001 ↗ | NANP-SPLIT OF 215 (PENNSYLVANIA) NUMBERING PLAN AREA (NPA) |