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 |
|---|---|---|---|---|
| 203-842 | Fairfield | Stamford | Global Crossing Local Services, Inc.-Ct | Landline |
| 203-843 | New Haven | New Haven | At&t Local | Landline |
| 203-844 | Fairfield | Fairfield | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-845 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-846 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-847 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-848 | New Haven | New Haven | Conversent Communications Of Connecticut, Llc | Landline |
| 203-849 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-850 | New Haven | New Haven | Metro Pcs, Inc. | Wireless |
| 203-851 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-852 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-853 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-854 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-855 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-856 | Fairfield | Norwalk | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-857 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-858 | Fairfield | Norwalk | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-859 | New Haven | New Haven | Mcimetro Access Transmission Services Llc | Landline |
| 203-861 | Fairfield | Greenwich | Verizon New York Inc. | Landline |
| 203-862 | Fairfield | Greenwich | Verizon New York Inc. | Landline |
| 203-863 | Fairfield | Greenwich | Verizon New York Inc. | Landline |
| 203-864 | Fairfield | Bridgeport | Sprint Spectrum L.p. | Wireless |
| 203-865 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-866 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-867 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-868 | New Haven | New Haven | At&t Local | Landline |
| 203-869 | Fairfield | Greenwich | Verizon New York Inc. | Landline |
| 203-870 | Fairfield | Bridgeport | Cablevision Lightpath, Inc. - CT | Landline |
| 203-871 | New Haven | Branford | Teleport Communications America, Llc - CT | Landline |
| 203-872 | New Haven | New Haven | At&t Local | Landline |
| 203-873 | Fairfield | Bridgeport | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-874 | New Haven | Milford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-875 | Fairfield | Darien | At&t Local | Landline |
| 203-876 | New Haven | Milford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-877 | New Haven | Milford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-878 | New Haven | Milford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-879 | New Haven | Wolcott | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-880 | Fairfield | Trumbull | Teleport Communications America, Llc - CT | Landline |
| 203-881 | New Haven | Seymour | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-882 | New Haven | Milford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-883 | Fairfield | Stamford | Level 3 Communications, Llc - CT | Landline |
| 203-884 | New Haven | Guilford | Global Crossing Local Services, Inc.-Ct | Landline |
| 203-885 | Fairfield | Danbury | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-886 | New Haven | Meriden | Choice One Communications, Inc. - CT | Landline |
| 203-887 | New Haven | New Haven | Sprint Spectrum L.p. | Wireless |
| 203-888 | New Haven | Seymour | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-889 | New Haven | New Haven | Global Crossing Local Services, Inc.-Ct | Landline |
| 203-890 | Fairfield | Stamford | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-891 | New Haven | New Haven | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-892 | Fairfield | Bridgeport | Omnipoint Communications, Inc. - CT | Wireless |
| 203-893 | New Haven | Derby | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-894 | Fairfield | Ridgefield | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-895 | Fairfield | Trumbull | New Cingular Wireless Pcs, Llc - DC | Wireless |
| 203-896 | New Haven | Madison | Global Crossing Local Services, Inc.-Ct | Landline |
| 203-897 | Fairfield | Stamford | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-898 | Fairfield | Darien | Brooks Fiber Communications Of Connecticut Inc-Ct | Landline |
| 203-899 | Fairfield | Norwalk | Southern New England Telco Dba Frontier Comm Of CT | Landline |
| 203-900 | Fairfield | Greenwich | Cablevision Lightpath, Inc. - CT | Landline |
| 203-901 | New Haven | New Haven | Sprint Spectrum L.p. | Wireless |
| 203-902 | New Haven | New Haven | Global Naps, Inc. - CT | Landline |
| 203-903 | New Haven | New Haven | Level 3 Communications, Llc - CT | Landline |
| 203-904 | Fairfield | Norwalk | Sprint Spectrum L.p. | Wireless |
| 203-905 | Fairfield | Stamford | Teleport Communications America, Llc - CT | Landline |
| 203-906 | New Haven | Derby | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-907 | New Haven | New Haven | Choice One Communications, Inc. - CT | Landline |
| 203-908 | Fairfield | Bridgeport | Omnipoint Communications, Inc. - CT | Wireless |
| 203-909 | New Haven | New Haven | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-910 | New Haven | Waterbury | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-912 | Fairfield | Stamford | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 203-913 | Fairfield | Bridgeport | Cellco Partnership Dba Verizon Wireless - CT | Wireless |
| 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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