The 203 Area Code (or Area Code 203) is located in the state of CT. Area Code 203 is one of the 269 3-digit telephone area codes in the USA. It covers roughly 2.85 million unique phone numbers and 10.3 million individuals near the city of New Haven
Area code 203 was put into service 01/01/1947. In 1995 Area code 203 was split to form area code 860. In 2009 area code 203 was overlaid with area code 475.
Ansonia, Branford, Bridgeport, Cheshire, Danbury, Darien, Derby, Fairfield, Greenwich, Guilford, Huntington, Madison, Meriden, Milford, Naugatuck, New Canaan, New Haven, Newtown, Northford, Norwalk, Old Greenwich, Redding, Ridgefield, Seymour, Southbury, Stamford, Trumbull, Wallingford, Waterbury, Westport, Wilton, Wolcott, Woodbury.
| PREFIX | COUNTY | CITY | CARRIER | TYPE |
|---|---|---|---|---|
| 203-414 | Fairfield | Bridgeport | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-415 | New Haven | New Haven | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-416 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-417 | Fairfield | Danbury | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-418 | Fairfield | Fairfield | Teleport Communications America, Llc - CT | Landline |
| 203-419 | New Haven | Waterbury | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-420 | New Haven | Meriden | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-421 | New Haven | Madison | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-422 | Fairfield | Greenwich | Verizon New York Inc. | Landline |
| 203-423 | Fairfield | Wilton | Teleport Communications America, Llc - CT | Landline |
| 203-424 | Fairfield | Danbury | Sprint Spectrum L.p. | Wireless |
| 203-425 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-426 | Fairfield | Newtown | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-427 | New Haven | Meriden | Mcimetro Access Transmission Services Llc | Landline |
| 203-428 | Fairfield | Stamford | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-429 | Fairfield | Stamford | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-430 | New Haven | New Haven | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-431 | Fairfield | Ridgefield | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-432 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-433 | New Haven | Branford | Comcast Phone Of Connecticut, Inc. - CT | Landline |
| 203-434 | Fairfield | Norwalk | Omnipoint Communications, Inc. - CT | Wireless |
| 203-435 | New Haven | New Haven | Omnipoint Communications, Inc. - CT | Wireless |
| 203-436 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-437 | New Haven | Waterbury | Mcimetro Access Transmission Services Llc | Landline |
| 203-438 | Fairfield | Ridgefield | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-439 | New Haven | Cheshire | Cox Connecticut Telecom, Llc | Landline |
| 203-440 | New Haven | Meriden | Cox Connecticut Telecom, Llc | Landline |
| 203-441 | New Haven | Wolcott | Teleport Communications America, Llc - CT | Landline |
| 203-442 | Fairfield | New Canaan | Teleport Communications America, Llc - CT | Landline |
| 203-443 | New Haven | Meriden | Mcimetro Access Transmission Services Llc | Landline |
| 203-444 | New Haven | New Haven | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-445 | Fairfield | Trumbull | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-446 | New Haven | Derby | Teleport Communications America, Llc - CT | Landline |
| 203-447 | Fairfield | Huntington | Teleport Communications America, Llc - CT | Landline |
| 203-448 | Fairfield | Danbury | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-449 | Fairfield | Bridgeport | Sprint Spectrum L.p. | Wireless |
| 203-450 | Fairfield | Bridgeport | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-451 | Fairfield | Westport | New Cingular Wireless Pcs, Llc - DC | Landline |
| 203-452 | Fairfield | Trumbull | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-453 | New Haven | Guilford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-454 | Fairfield | Westport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-455 | Fairfield | Bridgeport | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-456 | Fairfield | Danbury | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-457 | New Haven | Guilford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-458 | New Haven | Guilford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-459 | Fairfield | Trumbull | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-460 | Fairfield | Danbury | At&t Local | Landline |
| 203-461 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-462 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-463 | New Haven | Seymour | Teleport Communications America, Llc - CT | Landline |
| 203-464 | New Haven | New Haven | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-465 | New Haven | Waterbury | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-466 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-467 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-468 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-469 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-470 | Fairfield | Danbury | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-471 | Not available. | Billing Only | Southern New England Telco Dba Frontier Comm Of CT | |
| 203-472 | Not available. | Billing Only | Southern New England Telco Dba Frontier Comm Of CT | |
| 203-473 | Not available. | Billing Only | Southern New England Telco Dba Frontier Comm Of CT | |
| 203-474 | Not available. | Billing Only | Southern New England Telco Dba Frontier Comm Of CT | |
| 203-476 | Not available. | Billing Only | Southern New England Telco Dba Frontier Comm Of CT | |
| 203-477 | New Haven | New Haven | Usa Mobility Wireless, Inc. | Wireless |
| 203-478 | Not available. | Billing Only | Southern New England Telco Dba Frontier Comm Of CT | |
| 203-479 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-480 | Fairfield | Fairfield | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-481 | New Haven | Branford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-482 | Fairfield | Danbury | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-483 | New Haven | Branford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-484 | New Haven | Northford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| Phone Number 203-223-5069 |
USAGE Wireless |
City Stamford |
Operate Read more about who called from 2032235069 |
Update Time Mar-26-2026 |
| Phone Number 203-533-4247 |
USAGE Landline |
City Guilford |
Operate Read more about who called from 2035334247 |
Update Time Mar-26-2026 |
| Phone Number 203-935-8267 |
USAGE Landline |
City Meriden |
Operate Read more about who called from 2039358267 |
Update Time Mar-26-2026 |
| Phone Number 203-693-9975 |
USAGE Landline |
City Milford |
Operate Read more about who called from 2036939975 |
Update Time Mar-26-2026 |
| Phone Number 203-596-6069 |
USAGE Landline |
City Waterbury |
Operate Read more about who called from 2035966069 |
Update Time Mar-26-2026 |
| Phone Number 203-424-0354 |
USAGE Wireless |
City Danbury |
Operate Read more about who called from 2034240354 |
Update Time Mar-26-2026 |
| Phone Number 203-202-1394 |
USAGE Landline |
City Darien |
Operate Read more about who called from 2032021394 |
Update Time Mar-26-2026 |
| Phone Number 203-266-1528 |
USAGE Landline |
City Woodbury |
Operate Read more about who called from 2032661528 |
Update Time Mar-26-2026 |
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