Naugatuck Valley Planning Region, Connecticut

A planning region in Connecticut, ranked 4 of 9 by population.

Planning RegionFIPS 09140

Within Connecticut

Naugatuck Valley 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: 463,349; +14,356 (+3.2%) since 2020
Land area: 412.8; square miles. A further 2.1% of the total area is water
Population density: 1,122; people per square mile, computed rather than published
County seat: Not available; Naugatuck Valley Planning Region has no county government.
Established: Not available
Largest city: Waterbury city; Population 115,771.

Satellite view

Aerial imagery of Naugatuck Valley 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 Naugatuck Valley 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 635 by 800 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 Naugatuck Valley 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	463,349	4th of 9	161st of 3,144
Land area	412.8 sq mi	7th of 9	2,449th of 3,144
Population density	1,122 per sq mi	4th of 9	144th of 3,144
Median household income	$86,191	9th of 9	398th of 3,143

Full data for Naugatuck Valley 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	463,349	Vintage 2025 Population Estimates
Population in 2020	448,993	Vintage 2025 Population Estimates
2020 estimates base?	450,148	Vintage 2025 Population Estimates
Land area	412.8 sq mi	2025 Gazetteer Files
Water area	8.8 sq mi	2025 Gazetteer Files
Total area	421.6 sq mi	2025 Gazetteer Files
Population density?	1,122 per sq mi	Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income	$86,191	American Community Survey 2020-2024 5-Year Estimates
Median home value	$317,700	American Community Survey 2020-2024 5-Year Estimates
Median age	41.8	American Community Survey 2020-2024 5-Year Estimates
Households	180,116	American Community Survey 2020-2024 5-Year Estimates
Housing units	192,551	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: +140; 4,315 births, 4,175 deaths
Net migration: +1,707; 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 Naugatuck Valley 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
Northwest Hills Planning Region	Connecticut	35 mi	114,690
South Central Connecticut Planning Region	Connecticut	33 mi	578,741
Capitol Planning Region	Connecticut	21 mi	994,115
Greater Bridgeport Planning Region	Connecticut	17 mi	337,697
Western Connecticut Planning Region	Connecticut	15 mi	640,482

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.