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475 Area Code

Area Code Overview

Area code 475 is a geographic telephone area code in Connecticut that went into service on December 12, 2009. The geographic regions covered by this area code overlay has a population of approximately 1,780,990.

Overlay and Dialing Rules

  • Area Code: 475
  • State: Connecticut
  • Type: General Purpose Code
  • In Service Date: December 12, 2009
  • Overlay Complex: 203/475
  • Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 475

This area code is ranked 273rd out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 3rd out of 4.

2,637,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 475

Total assigned 2,637,000
Wireless
1,051,000 assigned
39.86%
Wireline and VoIP
1,403,000 assigned
53.20%
Other / Unclassified
183,000 assigned
6.94%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 475

Estimated assigned wireless phone numbers: 1,051,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

Verizon Wireless 456,000 (43.39%)
T-Mobile 338,000 (32.16%)
AT&T Wireless 240,000 (22.84%)
Optimum Mobile 17,000 (1.62%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 475

Estimated assigned wireline and VoIP phone numbers: 1,403,000

Onvoy 675,000 (48.11%)
Bandwidth 212,000 (15.11%)
Peerless Network 112,000 (7.98%)
Spectrum 111,000 (7.91%)
Comcast Business 60,000 (4.28%)
Telnyx 44,000 (3.14%)
Lumen 42,000 (2.99%)
EON TELECOM, INC. 40,000 (2.85%)
PAETEC ITEL, LLC 24,000 (1.71%)
Commio 19,000 (1.35%)
TERRA NOVA TELECOM INC. 14,000 (1.00%)
Vonage 11,000 (0.78%)

Other / Unclassified Assigned Numbering in Area Code 475

Estimated assigned other or unclassified phone numbers: 183,000

Verizon 51,000 (27.87%)
TELEPORT COMMUNICATIONS AMERICA, LLC - CT 28,000 (15.30%)
TON80 COMMUNICATIONS, LLC 28,000 (15.30%)
IP HORIZON LLC 24,000 (13.11%)
CSC VOICE, LLC 15,000 (8.20%)
FRACTEL, LLC 14,000 (7.65%)
TC SYSTEMS, INC. - NY 11,000 (6.01%)
BARR TEL USA, INC. - CT 8,000 (4.37%)
HD CARRIER LLC 4,000 (2.19%)

Cities and Towns in Area Code 475

Ansonia, Connecticut Branford, Connecticut Bridgeport, Connecticut Byram, Connecticut Cheshire, Connecticut Danbury, Connecticut Darien, Connecticut Fairfield, Connecticut Georgetown, Connecticut Greenwich, Connecticut Guilford, Connecticut Huntington, Connecticut Madison, Connecticut Meriden, Connecticut Milford, Connecticut Naugatuck, Connecticut New Canaan, Connecticut New Haven, Connecticut Newtown, Connecticut Norwalk, Connecticut Old Greenwich, Connecticut Redding, Connecticut Ridgefield, Connecticut Seymour, Connecticut Stamford, Connecticut Trumbull, Connecticut Wallingford, Connecticut Waterbury, Connecticut Westport, Connecticut Wilton, Connecticut Wolcott, Connecticut Woodbury, Connecticut

These geographic regions are also served by area code 203.

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 475, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm