539
Area code
OK
United States geographic area code, in service since 2011-04-01. Part of the 539/918 overlay complex — ten-digit dialing required.
Statusin service
Introduced2011-04-01
JurisdictionOK, US
Local dialing10D
Time zoneCentral
Last verified2026-09-17
Utilization 31.9% of assignable prefixes assigned
As of 09/17/2026
0%253 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 2011-10-04, most recent 2026-09-14.
Area codes serve rate-center geographies, not municipal boundaries. “OK” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | ONVOY, LLC - OK | 34 | 13.4% |
| 02 | LEVEL 3 COMMUNICATIONS, LLC - OK | 28 | 11.1% |
| 03 | FRACTEL, LLC | 22 | 8.7% |
| 04 | UNITED STATES CELLULAR - OK | 21 | 8.3% |
| 05 | BANDWIDTH.COM CLEC, LLC - OK | 18 | 7.1% |
| 06 | T-MOBILE USA, INC. | 17 | 6.7% |
| 07 | NEW CINGULAR WIRELESS PCS, LLC - IL | 12 | 4.7% |
| 08 | COMCAST IP PHONE, LLC | 10 | 4% |
| 09 | TON80 COMMUNICATIONS, LLC | 9 | 3.6% |
| 10 | MULTIPLE OCN LISTING | 9 | 3.6% |
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- 2010-03-01 NPA 539 to Overlay NPA 918 (Oklahoma)
- 2011-04-01Area code 539 entered service (created from 918).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2010-03-01 | PL-403 ↗ | NPA 539 to Overlay NPA 918 (Oklahoma) |