Connecticut County Map
Labeled county boundary map and complete directory of all 9 planning regions in Connecticut (CT, State FIPS 09). View 5-digit FIPS codes, county seats, land area in square miles, and official county government websites below.
Showing all 9 planning regions in Connecticut. Use the search box below to filter by county name, 5-digit FIPS code, or county seat.
Connecticut County Statistics & Summary
Total Planning Regions
9
Largest by Land Area
Capitol Planning Region
Smallest by Land Area
Greater Bridgeport Planning Region
Since 2022, the U.S. Census Bureau recognizes Connecticut’s 9 Councils of Governments (Planning Regions) as county-equivalent statistical entities.
All 9 Planning Regions in Connecticut (FIPS, County Seat & Official Website)
| Planning Region Name | 5-Digit FIPS | Seat / Administrative Center | Land Area (sq mi) | Coordinates | Official Website |
|---|---|---|---|---|---|
| Capitol Planning Region | 09110 | — | 1,027.4 | 41.817°, -72.576° | — |
| Greater Bridgeport Planning Region | 09120 | — | 140.2 | 41.185°, -73.209° | — |
| Lower Connecticut River Valley Planning Region | 09130 | — | 424.1 | 41.420°, -72.493° | — |
| Naugatuck Valley Planning Region | 09140 | — | 412.8 | 41.519°, -73.088° | — |
| Northeastern Connecticut Planning Region | 09150 | — | 553.9 | 41.842°, -71.973° | — |
| Northwest Hills Planning Region | 09160 | — | 786.6 | 41.855°, -73.222° | — |
| South Central Connecticut Planning Region | 09170 | — | 367.3 | 41.290°, -72.837° | — |
| Southeastern Connecticut Planning Region | 09180 | — | 598.1 | 41.485°, -72.102° | — |
| Western Connecticut Planning Region | 09190 | — | 532.1 | 41.279°, -73.447° | — |
How Connecticut Planning Regions and 5-Digit FIPS Codes Work
In U.S. Census Bureau TIGER/Line geography, Connecticut (CT) is assigned the 2-digit state Federal Information Processing Series (FIPS) code 09 and covers 4,843 square miles of land area across 9 planning regions in the Eastern Time (ET) zone (with Hartford as the state capital). Every planning region in the directory above carries a unique 5-digit GEOID formed by combining state prefix 09 with a 3-digit county code (ranging alphabetically from Capitol Planning Region at 09110 to Western Connecticut Planning Region at 09190).
Because U.S. Postal Service 5-digit ZIP Codes follow mail carrier delivery routes rather than local government borders, many postal addresses in Connecticut carry a neighboring city’s mailing name or sit inside a multi-county ZIP Code Tabulation Area (ZCTA). Property tax assessments, deed recording, circuit and county court venue, voter registration precincts, sheriff jurisdiction, and county sales tax rates in Connecticut are determined by the legal planning region boundary shown on the map above rather than the postal city name on an envelope.
Land area figures in square miles and internal centroid coordinates (INTPTLAT, INTPTLON) come directly from the U.S. Census Bureau’s current TIGERweb State_County benchmark, while 0 administrative seats and 0 verified official government websites are cross-referenced from Wikidata (CC0). Need a clean outline worksheet without county labels, or want to verify which Connecticut planning region a specific home or business address sits in? Open the Blank Map of Connecticut, run a street-segment check on Address to County Lookup, check multi-county postal overlap on ZIP Code to County Lookup, or browse all 50 states on the National U.S. County Map.
Adjacent State County Maps
Explore county maps and FIPS directories for states bordering Connecticut: