513
Area code
OH
United States geographic area code, in service since 1947-01-01. Part of the 283/513 overlay complex — ten-digit dialing required.
Statusin service
Introduced1947-01-01
JurisdictionOH, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 100.9% of assignable prefixes assigned
As of 09/17/2026
0%799 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 2001-03-06, most recent 2024-02-02.
Area codes serve rate-center geographies, not municipal boundaries. “OH” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | CINCINNATI BELL | 251 | 31.4% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 125 | 15.6% |
| 03 | T-MOBILE USA, INC. | 79 | 9.9% |
| 04 | NEW CINGULAR WIRELESS PCS, LLC - IL | 55 | 6.9% |
| 05 | LEVEL 3 COMMUNICATIONS, LLC - OH | 39 | 4.9% |
| 06 | ONVOY, LLC - OH | 36 | 4.5% |
| 07 | BANDWIDTH.COM CLEC, LLC - OH | 19 | 2.4% |
| 08 | SPOK, INC. | 17 | 2.1% |
| 09 | PAETEC ITEL, LLC | 16 | 2% |
| 10 | LEVEL 3 TELECOM OF OHIO, LLC - OH | 16 | 2% |
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- 2022-02-11 NPA 283 to Overlay NPA 513 (Ohio)
- 2001-04-24 NPA 513 Boundary Realignment Franklin Rate Center (Ohio) other
- 1947-01-01Area code 513 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2022-02-11 | PL-579 ↗ | NPA 283 to Overlay NPA 513 (Ohio) |
| 2021-01-08 | PL-556 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Lifeline) – supersedes PL-544 |
| 2020-08-17 | PL-544 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline |
| 2002-03-25 | PL-316 ↗ | Suspension of 513/283 NPA Overlay (Ohio) |
| 2001-06-29 | PL-286 ↗ | Mandatory Dialing Date Established for NPA 283 (Ohio) |
| 2001-04-24 | PL-272 ↗ | NPA 513 Boundary Realignment Franklin Rate Center (Ohio) |
| 2001-02-27 | PL-264 ↗ | New NPA 283 to Overlay NPA 513 (Ohio) |