Area Code Details for: 203
Location
State
Connecticut
Country
US
Map
Details
State | Connecticut (CT) |
Time Zone | |
Parent NPA | - |
Relief Planning in ProgressArea code relief planning is the process of addressing the exhaustion of available telephone numbers within an area code. When the supply of numbers in an existing area code is running low, NANPA works with the telecommunications industry to introduce new area codes. | No |
In Service Date | January 1, 1947 |
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Cities
| Zipcode | City | County |
|---|---|---|
| 06540 | New Haven, CT | New Haven |
| 06601 | Bridgeport, CT | Fairfield |
| 06537 | New Haven, CT | New Haven |
| 06538 | New Haven, CT | New Haven |
| 06602 | Bridgeport, CT | Fairfield |
| 06606 | Bridgeport, CT | Fairfield |
| 06607 | Bridgeport, CT | Fairfield |
| 06604 | Bridgeport, CT | Fairfield |
| 06605 | Bridgeport, CT | Fairfield |
| 06536 | New Haven, CT | New Haven |
| 06525 | Woodbridge, CT | New Haven |
| 06530 | New Haven, CT | New Haven |
| 06521 | New Haven, CT | New Haven |
| 06524 | Bethany, CT | New Haven |
| 06531 | New Haven, CT | New Haven |
| 06534 | New Haven, CT | New Haven |
| 06535 | New Haven, CT | New Haven |
| 06532 | New Haven, CT | New Haven |
| 06533 | New Haven, CT | New Haven |
| 06608 | Bridgeport, CT | Fairfield |
| 06507 | New Haven, CT | New Haven |
| 06508 | New Haven, CT | New Haven |
| 06505 | New Haven, CT | New Haven |
| 06506 | New Haven, CT | New Haven |
| 06509 | New Haven, CT | New Haven |
| 06615 | Stratford, CT | Fairfield |
| 06673 | Bridgeport, CT | Fairfield |
| 06510 | New Haven, CT | New Haven |
| 06614 | Stratford, CT | Fairfield |
| 06504 | New Haven, CT | New Haven |
| 06612 | Easton, CT | Fairfield |
| 06493 | Wallingford, CT | New Haven |
| 06610 | Bridgeport, CT | Fairfield |
| 06611 | Trumbull, CT | Fairfield |
| 06494 | Wallingford, CT | New Haven |
| 06502 | New Haven, CT | New Haven |
| 06503 | New Haven, CT | New Haven |
| 06495 | Wallingford, CT | New Haven |
| 06501 | New Haven, CT | New Haven |
| 06418 | Derby, CT | New Haven |
| 06437 | Guilford, CT | New Haven |
| 06410 | Cheshire, CT | New Haven |
| 06411 | Cheshire, CT | New Haven |
| 06440 | Hawleyville, CT | Fairfield |
| 06451 | Meriden, CT | New Haven |
| 06460 | Milford, CT | New Haven |
| 06443 | Madison, CT | New Haven |
| 06450 | Meriden, CT | New Haven |
| 06515 | New Haven, CT | New Haven |
| 06514 | Hamden, CT | New Haven |
| 06401 | Ansonia, CT | New Haven |
| 06512 | East Haven, CT | New Haven |
| 06513 | New Haven, CT | New Haven |
| 06403 | Beacon Falls, CT | New Haven |
| 06405 | Branford, CT | New Haven |
| 06408 | Cheshire, CT | New Haven |
| 06511 | New Haven, CT | New Haven |
| 06404 | Botsford, CT | Fairfield |
| 06461 | Milford, CT | New Haven |
| 06491 | Stevenson, CT | Fairfield |
| 06492 | Wallingford, CT | New Haven |
| 06487 | South Britain, CT | New Haven |
| 06488 | Southbury, CT | New Haven |
| 06516 | West Haven, CT | New Haven |
| 06519 | New Haven, CT | New Haven |
| 06520 | New Haven, CT | New Haven |
| 06517 | Hamden, CT | New Haven |
| 06518 | Hamden, CT | New Haven |
| 06484 | Shelton, CT | Fairfield |
| 06471 | North Branford, CT | New Haven |
| 06472 | Northford, CT | New Haven |
| 06468 | Monroe, CT | Fairfield |
| 06470 | Newtown, CT | Fairfield |
| 06473 | North Haven, CT | New Haven |
| 06482 | Sandy Hook, CT | Fairfield |
| 06483 | Seymour, CT | New Haven |
| 06477 | Orange, CT | New Haven |
| 06478 | Oxford, CT | New Haven |
| 06699 | Bridgeport, CT | Fairfield |
| 06875 | Redding Center, CT | Fairfield |
| 06876 | Redding Ridge, CT | Fairfield |
| 06870 | Old Greenwich, CT | Fairfield |
| 06858 | Norwalk, CT | Fairfield |
| 06860 | Norwalk, CT | Fairfield |
| 06880 | Westport, CT | Fairfield |
| 06881 | Westport, CT | Fairfield |
| 06879 | Ridgefield, CT | Fairfield |
| 06877 | Ridgefield, CT | Fairfield |
| 06878 | Riverside, CT | Fairfield |
| 06851 | Norwalk, CT | Fairfield |
| 06852 | Norwalk, CT | Fairfield |
| 06850 | Norwalk, CT | Fairfield |
| 06838 | Greens Farms, CT | Fairfield |
| 06840 | New Canaan, CT | Fairfield |
| 06856 | Norwalk, CT | Fairfield |
| 06857 | Norwalk, CT | Fairfield |
| 06855 | Norwalk, CT | Fairfield |
| 06853 | Norwalk, CT | Fairfield |
| 06854 | Norwalk, CT | Fairfield |
| 06910 | Stamford, CT | Fairfield |
| 06911 | Stamford, CT | Fairfield |
| 06907 | Stamford, CT | Fairfield |
| 06905 | Stamford, CT | Fairfield |
| 06906 | Stamford, CT | Fairfield |
| 06926 | Stamford, CT | Fairfield |
| 06927 | Stamford, CT | Fairfield |
| 06914 | Stamford, CT | Fairfield |
| 06912 | Stamford, CT | Fairfield |
| 06913 | Stamford, CT | Fairfield |
| 06890 | Southport, CT | Fairfield |
| 06896 | Redding, CT | Fairfield |
| 06889 | Westport, CT | Fairfield |
| 06883 | Weston, CT | Fairfield |
| 06888 | Westport, CT | Fairfield |
| 06903 | Stamford, CT | Fairfield |
| 06904 | Stamford, CT | Fairfield |
| 06902 | Stamford, CT | Fairfield |
| 06897 | Wilton, CT | Fairfield |
| 06901 | Stamford, CT | Fairfield |
| 06722 | Waterbury, CT | New Haven |
| 06723 | Waterbury, CT | New Haven |
| 06720 | Waterbury, CT | New Haven |
| 06721 | Waterbury, CT | New Haven |
| 06724 | Waterbury, CT | New Haven |
| 06751 | Bethlehem, CT | Litchfield |
| 06762 | Middlebury, CT | New Haven |
| 06725 | Waterbury, CT | New Haven |
| 06726 | Waterbury, CT | New Haven |
| 06716 | Wolcott, CT | New Haven |
| 06703 | Waterbury, CT | New Haven |
| 06704 | Waterbury, CT | New Haven |
| 06701 | Waterbury, CT | New Haven |
| 06702 | Waterbury, CT | New Haven |
| 06705 | Waterbury, CT | New Haven |
| 06710 | Waterbury, CT | New Haven |
| 06712 | Prospect, CT | New Haven |
| 06706 | Waterbury, CT | New Haven |
| 06708 | Waterbury, CT | New Haven |
| 06824 | Fairfield, CT | Fairfield |
| 06825 | Fairfield, CT | Fairfield |
| 06813 | Danbury, CT | Fairfield |
| 06820 | Darien, CT | Fairfield |
| 06828 | Fairfield, CT | Fairfield |
| 06831 | Greenwich, CT | Fairfield |
| 06830 | Greenwich, CT | Fairfield |
| 06829 | Georgetown, CT | Fairfield |
| 06836 | Greenwich, CT | Fairfield |
| 06812 | New Fairfield, CT | Fairfield |
| 06784 | Sherman, CT | Fairfield |
| 06798 | Woodbury, CT | Litchfield |
| 06770 | Naugatuck, CT | New Haven |
| 06783 | Roxbury, CT | Litchfield |
| 06801 | Bethel, CT | Fairfield |
| 06807 | Cos Cob, CT | Fairfield |
| 06811 | Danbury, CT | Fairfield |
| 06804 | Brookfield, CT | Fairfield |
| 06810 | Danbury, CT | Fairfield |
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