475
Area code
CT
United States geographic area code, in service since 2009-12-12. Part of the 203/475 overlay complex — ten-digit dialing required.
Statusin service
Introduced2009-12-12
JurisdictionCT, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 38.4% of assignable prefixes assigned
As of 09/17/2026
0%304 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 2009-08-07, most recent 2026-09-09.
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 | 64 | 21.1% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 47 | 15.5% |
| 03 | OMNIPOINT COMMUNICATIONS, INC. - CT | 39 | 12.8% |
| 04 | NEW CINGULAR WIRELESS PCS, LLC - DC | 18 | 5.9% |
| 05 | BANDWIDTH.COM CLEC, LLC - CT | 18 | 5.9% |
| 06 | TON80 COMMUNICATIONS, LLC | 17 | 5.6% |
| 07 | PEERLESS NETWORK OF CONNECTICUT, LLC - CT | 15 | 4.9% |
| 08 | FRACTEL, LLC | 12 | 3.9% |
| 09 | MULTIPLE OCN LISTING | 9 | 3% |
| 10 | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 5 | 1.6% |
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- 2009-04-14 NPA 475 to Overlay NPA 203; NPA 860 10-digit dialing (Connecticut)
- 2009-12-12Area code 475 entered service (created from 203).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2009-04-14 | PL-388 ↗ | NPA 475 to Overlay NPA 203; NPA 860 10-digit dialing (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) |