330
Area code
OH
United States geographic area code, in service since 1996-03-09. Part of the 234/330 overlay complex — ten-digit dialing required.
Statusin service
Introduced1996-03-09
JurisdictionOH, 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 2001-01-05, most recent 2024-06-25.
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 | OHIO BELL TEL CO | 198 | 24.8% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 116 | 14.5% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - IL | 64 | 8% |
| 04 | T-MOBILE USA, INC. | 62 | 7.8% |
| 05 | BRIGHTSPEED OF NORTHWEST OHIO, INC. | 60 | 7.5% |
| 06 | LEVEL 3 COMMUNICATIONS, LLC - OH | 58 | 7.2% |
| 07 | FRONTIER NORTH, INC. - OH | 56 | 7% |
| 08 | WINDSTREAM WESTERN RESERVE, INC. | 24 | 3% |
| 09 | SPOK, INC. | 23 | 2.9% |
| 10 | PAETEC ITEL, LLC | 22 | 2.8% |
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- 2000-02-21 NPA 234 to Overlay NPA 330 (Ohio)
- 1996-03-09Area code 330 entered service (created from 216).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2000-02-21 | PL-213 ↗ | NPA 234 to Overlay NPA 330 (Ohio) |
| 1995-11-17 | IL-95-11-008 ↗ | NANP-SPLIT OF 216 (OHIO) NUMBERING PLAN AREA (NPA) |