South Central Connecticut Planning Region, Connecticut

A planning region in Connecticut, ranked 3 of 9 by population.

Planning RegionFIPS 09170

Within Connecticut

South Central Connecticut Planning Region, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data.

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Population: 578,741; +14,292 (+2.5%) since 2020
Land area: 367.3; square miles. A further 40.7% of the total area is water
Population density: 1,576; people per square mile, computed rather than published
County seat: Not available; South Central Connecticut Planning Region has no county government.
Established: Not available
Largest city: New Haven city; Population 138,774.

Satellite view

Aerial imagery of South Central Connecticut Planning Region with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of South Central Connecticut Planning Region, Connecticut from the USGS National Map, with its boundary outlined — Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 752 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where South Central Connecticut Planning Region ranks

Position among the 9 planning regions of Connecticut, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

Measure	Value	In Connecticut	Nationally
Population	578,741	3rd of 9	125th of 3,144
Land area	367.3 sq mi	8th of 9	2,639th of 3,144
Population density	1,576 per sq mi	2nd of 9	102nd of 3,144
Median household income	$88,197	7th of 9	346th of 3,143

Full data for South Central Connecticut Planning Region

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
Measure	Value	Source and vintage
Population	578,741	Vintage 2025 Population Estimates
Population in 2020	564,449	Vintage 2025 Population Estimates
2020 estimates base?	570,746	Vintage 2025 Population Estimates
Land area	367.3 sq mi	2025 Gazetteer Files
Water area	252.3 sq mi	2025 Gazetteer Files
Total area	619.6 sq mi	2025 Gazetteer Files
Population density?	1,576 per sq mi	Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income	$88,197	American Community Survey 2020-2024 5-Year Estimates
Median home value	$353,100	American Community Survey 2020-2024 5-Year Estimates
Median age	40.2	American Community Survey 2020-2024 5-Year Estimates
Households	230,673	American Community Survey 2020-2024 5-Year Estimates
Housing units	248,267	American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths: +113; 5,538 births, 5,425 deaths
Net migration: +1,064; More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering South Central Connecticut Planning Region

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering area	State	Shared border	Population
Lower Connecticut River Valley Planning Region	Connecticut	42 mi	177,311
Naugatuck Valley Planning Region	Connecticut	33 mi	463,349
Suffolk County	New York	25 mi	1,546,090
Greater Bridgeport Planning Region	Connecticut	15 mi	337,697
Capitol Planning Region	Connecticut	9.2 mi	994,115

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

Side by side

All 9 planning regions of Connecticut

Open the interactive Connecticut county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.