440
Area code
OH
United States geographic area code, in service since 1997-08-16. Part of the 440/436 overlay complex — ten-digit dialing required.
Statusin service
Introduced1997-08-16
JurisdictionOH, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 97.3% of assignable prefixes assigned
As of 09/17/2026
0%771 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 2001-01-10, most recent 2026-01-14.
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 | 124 | 16.1% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 115 | 14.9% |
| 03 | LEVEL 3 COMMUNICATIONS, LLC - OH | 68 | 8.8% |
| 04 | T-MOBILE USA, INC. | 62 | 8% |
| 05 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 52 | 6.7% |
| 06 | NEW CINGULAR WIRELESS PCS, LLC - IL | 45 | 5.8% |
| 07 | WINDSTREAM WESTERN RESERVE, INC. | 39 | 5.1% |
| 08 | ONVOY, LLC - OH | 36 | 4.7% |
| 09 | TELEPORT COMMUNICATIONS AMERICA, LLC - OH | 31 | 4% |
| 10 | BRIGHTSPEED OF OHIO, LLC | 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- 2023-02-16 NPA 436 to Overlay NPA 440 (Ohio)
- 1997-08-16Area code 440 entered service (created from 216).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2023-02-16 | PL-610 ↗ | NPA 436 to Overlay NPA 440 (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 |
| 1997-03-12 | PL-045 ↗ | NANP-Split of 216 (Ohio) Numbering Plan Area (NPA) |