Connecticut

Postal abbreviation CT. 429 ZIP codes across 9 counties.

Population3,624,508
Postal abbreviationCT
ZIP codes429 ZIP codes →
Area codes203475860959
Time zoneEastern
Counties9

Largest cities by population

Bridgeport · 149,153Stamford · 137,144New Haven · 134,349Hartford · 121,127Waterbury · 114,869Norwalk · 92,187Danbury · 87,263New Britain · 74,223West Hartford · 63,620Bristol · 61,462Meriden · 60,545West Haven · 55,351East Hartford · 50,918Middletown · 47,958Shelton · 41,889Norwich · 39,973Manchester · 36,759Torrington · 35,547Naugatuck · 31,800Newington · 30,896New London · 27,625Wethersfield · 27,250North Haven · 24,336Ansonia · 19,033Willimantic · 18,096Greenwich · 14,792Orange · 14,315

Largest counties by population

Capitol Planning Region · 977,290Western Connecticut Planning Region · 627,071South Central Connecticut Planning Region · 570,598Naugatuck Valley Planning Region · 454,969Greater Bridgeport Planning Region · 329,259Southeastern Connecticut Planning Region · 279,971Lower Connecticut River Valley Planning Region · 175,822Northwest Hills Planning Region · 113,216Northeastern Connecticut Planning Region · 96,312

Counties in Connecticut

Capitol Planning RegionGreater Bridgeport Planning RegionLower Connecticut River Valley Planning RegionNaugatuck Valley Planning RegionNortheastern Connecticut Planning RegionNorthwest Hills Planning RegionSouth Central Connecticut Planning RegionSoutheastern Connecticut Planning RegionWestern Connecticut Planning Region

Population: U.S. Census Bureau, ACS 5-year estimates, 2024.