Founded in 1666, New Haven County is one of 8 counties in the state of Connecticut. The city of New Haven is the county seat. With FIPS code of 9, New Haven County has a population of 863,700 and area of 606 square miles (1,570 km2).
List of all cities in New Haven County, CT alphabetically
| City/Town | Postal Code | Area Code |
| Advertising Distr Co, CT | 06537 | 203/475 |
| 06538 | 203/475 | |
| Allingtown, CT | 06516 | 203/475 |
| Ansonia, CT | 06401 | 203/475 |
| Beacon Falls, CT | 06403 | 203/475 |
| Bethany, CT | 06524 | 203/475 |
| Bloomingdales by Mail Ltd, CT | 06411 | 203/475 |
| Branford, CT | 06405 | 203/475 |
| Centerville-Mount Carmel, CT | 06518 | 203/475 |
| Cheshire, CT | 06408 | 203/475 |
| 06410 | 203/475 | |
| 06411 | 203/475 | |
| Conn Bank & Trust Co, CT | 06540 | 203/475 |
| Ct Gen Med Claims Office, CT | 06493 | 203/475 |
| Derby, CT | 06418 | 203/475 |
| East End, CT | 06705 | 203/475 |
| East Haven, CT | 06512 | 203/475 |
| 06513 | 203/475 | |
| Fair Haven, CT | 06513 | 203/475 |
| Fosdick Corp, CT | 06494 | 203/475 |
| Guilford, CT | 06437 | 203/475 |
| Hamden, CT | 06511 | 203/475 |
| 06514 | 203/475 | |
| 06517 | 203/475 | |
| 06518 | 203/475 | |
| International Masters Pub, CT | 06495 | 203/475 |
| Macys By Mail, CT | 06408 | 203/475 |
| Madison, CT | 06443 | 203/475 |
| Meriden, CT | 06450 | 203/475 |
| 06451 | 203/475 | |
| Middlebury, CT | 06749 | 203/475 |
| 06762 | 203/475 | |
| Milford, CT | 06460 | 203/475 |
| 06461 | 203/475 | |
| Mount Carmel, CT | 06518 | 203/475 |
| Naugatuck, CT | 06770 | 203/475 |
| New Haven, CT | 06501 | 203/475 |
| 06502 | 203/475 | |
| 06503 | 203/475 | |
| 06504 | 203/475 | |
| 06505 | 203/475 | |
| 06506 | 203/475 | |
| 06507 | 203/475 | |
| 06508 | 203/475 | |
| 06509 | 203/475 | |
| 06510 | 203/475 | |
| 06511 | 203/475 | |
| 06512 | 203/475 | |
| 06513 | 203/475 | |
| 06514 | 203/475 | |
| 06515 | 203/475 | |
| 06516 | 203/475 | |
| 06517 | 203/475 | |
| 06518 | 203/475 | |
| 06519 | 203/475 | |
| 06520 | 203/475 | |
| 06521 | 203/475 | |
| 06524 | 203/475 | |
| 06525 | 203/475 | |
| 06530 | 203/475 | |
| 06531 | 203/475 | |
| 06532 | 203/475 | |
| 06533 | 203/475 | |
| 06534 | 203/475 | |
| 06535 | 203/475 | |
| 06536 | 203/475 | |
| 06537 | 203/475 | |
| 06538 | 203/475 | |
| 06540 | 203/475 | |
| North Branford, CT | 06471 | 203/475 |
| North Haven, CT | 06473 | 203/475 |
| 06501 | 203/475 | |
| 06502 | 203/475 | |
| 06503 | 203/475 | |
| 06504 | 203/475 | |
| 06505 | 203/475 | |
| 06506 | 203/475 | |
| 06507 | 203/475 | |
| 06508 | 203/475 | |
| 06509 | 203/475 | |
| 06510 | 203/475 | |
| 06511 | 203/475 | |
| 06512 | 203/475 | |
| 06513 | 203/475 | |
| 06514 | 203/475 | |
| 06515 | 203/475 | |
| 06516 | 203/475 | |
| 06518 | 203/475 | |
| 06519 | 203/475 | |
| 06520 | 203/475 | |
| 06521 | 203/475 | |
| 06525 | 203/475 | |
| 06530 | 203/475 | |
| 06531 | 203/475 | |
| 06532 | 203/475 | |
| 06533 | 203/475 | |
| 06534 | 203/475 | |
| 06535 | 203/475 | |
| 06536 | 203/475 | |
| 06537 | 203/475 | |
| 06538 | 203/475 | |
| Northford, CT | 06472 | 203/475 |
| Orange, CT | 06477 | 203/475 |
| Oxford, CT | 06478 | 203/475 |
| Plaza, CT | 06704 | 203/475 |
| Prospect, CT | 06712 | 203/475 |
| Seymour, CT | 06478 | 203/475 |
| 06483 | 203/475 | |
| South Britain, CT | 06487 | 203/475 |
| Southbury, CT | 06488 | 203/475 |
| U S Postal Service, CT | 06701 | 203/475 |
| Union City, CT | 06770 | 203/475 |
| Uniroyal Inc, CT | 06749 | 203/475 |
| Wallingford, CT | 06492 | 203/475 |
| 06493 | 203/475 | |
| 06494 | 203/475 | |
| 06495 | 203/475 | |
| Waterbury, CT | 06701 | 203/475 |
| 06702 | 203/475 | |
| 06703 | 203/475 | |
| 06704 | 203/475 | |
| 06705 | 203/475 | |
| 06706 | 203/475 | |
| 06708 | 203/475 | |
| 06710 | 203/475 | |
| 06712 | 203/475 | |
| 06716 | 203/475 | |
| 06720 | 203/475 | |
| 06721 | 203/475 | |
| 06722 | 203/475 | |
| 06723 | 203/475 | |
| 06724 | 203/475 | |
| 06725 | 203/475 | |
| 06726 | 203/475 | |
| 06749 | 203/475 | |
| West Haven, CT | 06516 | 203/475 |
| Westville, CT | 06515 | 203/475 |
| Whitneyville, CT | 06517 | 203/475 |
| Wolcott, CT | 06705 | 203/475 |
| 06716 | 203/475 | |
| Woodbridge, CT | 06525 | 203/475 |
| Yalesville, CT | 06492 | 203/475 |
Map of Cities in New Haven County, CT
