959
Area code
CT
United States geographic area code, in service since 2014-08-30. Part of the 860/959 overlay complex — ten-digit dialing required.
Statusin service
Introduced2014-08-30
JurisdictionCT, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 22.3% of assignable prefixes assigned
As of 09/17/2026
0%177 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 2014-09-18, most recent 2026-09-15.
Area codes serve rate-center geographies, not municipal boundaries. “CT” 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 - CT | 46 | 26% |
| 02 | TON80 COMMUNICATIONS, LLC | 27 | 15.3% |
| 03 | OMNIPOINT COMMUNICATIONS, INC. - CT | 14 | 7.9% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 14 | 7.9% |
| 05 | ONVOY SPECTRUM, LLC | 9 | 5.1% |
| 06 | MULTIPLE OCN LISTING | 9 | 5.1% |
| 07 | FRACTEL, LLC | 8 | 4.5% |
| 08 | TELEPORT COMMUNICATIONS AMERICA, LLC - CT | 6 | 3.4% |
| 09 | BANDWIDTH.COM CLEC, LLC - CT | 5 | 2.8% |
| 10 | 5 | 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- 2013-08-27 NPA 959 to Overlay NPA 860 (Connecticut)
- 2014-08-30Area code 959 entered service (created from 860).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2013-08-27 | PL-456 ↗ | NPA 959 to Overlay NPA 860 (Connecticut) |
| 2001-01-03 | PL-255 ↗ | Update on the Introduction of NPAs 475 and 959 (Connecticut) |
| 2000-02-24 | PL-217 ↗ | NPA 475 To Overlay NPA 203; NPA 959 To Overlay NPA 860 (Connecticut) |