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 |
|---|---|---|---|---|
| 203-343 | New Haven | Derby | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-344 | Fairfield | Old Greenwich | Cablevision Lightpath, Inc. - CT | Landline |
| 203-345 | Fairfield | Bridgeport | Cablevision Lightpath, Inc. - CT | Landline |
| 203-346 | New Haven | Waterbury | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-347 | Fairfield | Greenwich | Level 3 Communications, Llc - CT | Landline |
| 203-348 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-349 | Fairfield | Westport | Teleport Communications America, Llc - CT | Landline |
| 203-350 | New Haven | Madison | Teleport Communications America, Llc - CT | Landline |
| 203-351 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-352 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-353 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-354 | Fairfield | Norwalk | Cablevision Lightpath, Inc. - CT | Landline |
| 203-355 | Fairfield | Stamford | Cablevision Lightpath, Inc. - CT | Landline |
| 203-356 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-357 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-358 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-359 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-360 | Fairfield | Bridgeport | Metro Pcs, Inc. | Wireless |
| 203-361 | New Haven | New Haven | Level 3 Communications, Llc - CT | Landline |
| 203-362 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-363 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-364 | Fairfield | Newtown | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-365 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-366 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-367 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-368 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-369 | Fairfield | Old Greenwich | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-370 | New Haven | New Haven | American Messaging Services, Llc | Wireless |
| 203-371 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-372 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-373 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-374 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-375 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-376 | New Haven | New Haven | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-377 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-378 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-379 | New Haven | Meriden | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-380 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-381 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-382 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-383 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-384 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-385 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-386 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-387 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-388 | Fairfield | Stamford | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-389 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-390 | New Haven | New Haven | Teleport Communications America, Llc - CT | Wireless |
| 203-391 | Fairfield | Stamford | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-392 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-393 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-394 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-395 | Fairfield | Bridgeport | Sprint Spectrum L.p. | Wireless |
| 203-396 | Fairfield | Bridgeport | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-397 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-398 | Fairfield | Norwalk | Usa Mobility Wireless, Inc. | Wireless |
| 203-399 | Fairfield | Stamford | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-400 | Fairfield | Trumbull | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-401 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-402 | Fairfield | Huntington | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-403 | Fairfield | Ridgefield | Teleport Communications America, Llc - CT | Landline |
| 203-404 | New Haven | New Haven | Broadwing Communications, Llc - CT | Landline |
| 203-405 | Litchfield | Woodbury | Paetec Communications, Llc - CT | Landline |
| 203-406 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-407 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-408 | Fairfield | Redding | At&t Local | Landline |
| 203-409 | Fairfield | Old Greenwich | Teleport Communications America, Llc - CT | Landline |
| 203-410 | New Haven | New Haven | Sprint Spectrum L.p. | Wireless |
| 203-412 | New Haven | New Haven | American Messaging Services, Llc | Wireless |
| 203-413 | Fairfield | Greenwich | Paetec Communications, Inc. - NY | 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 |
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Update Time Mar-26-2026 |
| Phone Number 203-596-6069 |
USAGE Landline |
City Waterbury |
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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 |
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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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