Census tract · Naugatuck Valley Planning Region
Census Tract 3521, Naugatuck Valley Planning Region, Connecticut
Census Tract 3521, GEOID 09140352100, in Naugatuck Valley Planning Region, Connecticut, entirely within Waterbury. 4,460 residents in the ACS 2020-2024 5-year estimates (±779); the 2020 Census counted 4,359.
Residents, 2020-2024
4,460
±779 (90% margin)
2020 Census count: 4,359
Median household income
$71,250
±$33,128 (90% margin)
Naugatuck Valley Planning Region: $86,191
Median home value
$198,600
±$23,333 (90% margin)
Naugatuck Valley Planning Region: $317,700
Median gross rent
$1,195
±$158 (90% margin)
Naugatuck Valley Planning Region: $1,330
Where is Census Tract 3521?
Census Tract 3521 is one of 98 census tracts in Naugatuck Valley Planning Region, Connecticut. It covers 0.66 square miles of land, 6,595 residents per square mile in 2020. Its GEOID, 09140352100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Waterbury | 100% |
4 census tracts border Census Tract 3521: Tract 3520 ($80,576), Tract 3522 ($42,568), Tract 3603 ($90,648) and Tract 3604 ($103,394). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 3521?
The 2020-2024 American Community Survey puts Census Tract 3521's population at 4,460 (±779) in 1,739 households; the 2020 Census counted 4,359 residents and 1,744 housing units.
| Measure | Tract 3521 | Waterbury |
|---|---|---|
| Total population | 4,460 ±779 | 114,869 |
| Households | 1,739 ±283 | 45,663 |
| Average household size | 2.50 ±0.30 | 2.48 |
| Housing units | 1,842 ±268 | 49,956 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 3521?
The median resident of Census Tract 3521 is 39.1 years old; 22.4% are under 18 and 15.2% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 34.7%, then non-Hispanic white residents at 30.1%. 17.4% of residents were born outside the United States.
| Measure | Tract 3521 | Waterbury |
|---|---|---|
| Median age | 39.1 ±3.7 | 37.8 |
| Under 18 years | 22.4% ±5.1 pts | 23.2% |
| 65 years and over | 15.2% ±5.7 pts | 15.3% |
| Hispanic or Latino (any race) | 34.7% ±10.8 pts | 38.5% |
| White alone, not Hispanic | 30.1% ±8.1 pts | 29.3% |
| Black or African American alone, not Hispanic | 22.9% ±8.1 pts | 23.0% |
| Asian alone, not Hispanic | 0.0% ±0.9 pts | 2.5% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.9 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.9 pts | 0.0% |
| Two or more races, not Hispanic | 10.0% ±6.1 pts | 5.1% |
| Some other race alone, not Hispanic | 2.3% ±2.4 pts | 1.4% |
| Born outside the United States | 17.4% ±8.1 pts | 20.1% |
| Speak a language other than English at home (age 5+) | 32.5% ±10.2 pts | 39.3% |
| Civilian veterans (age 18+) | 4.3% ±2.8 pts | 3.6% |
| With a disability | 18.7% ±6.0 pts | 18.5% |
| No health insurance coverage | 9.0% ±5.6 pts | 8.4% |
| High school graduate or higher (age 25+) | 87.5% ±5.7 pts | 80.8% |
| Bachelor's degree or higher (age 25+) | 20.1% ±10.2 pts | 17.3% |
| Graduate or professional degree (age 25+) | 9.1% ±6.0 pts | 7.0% |
| Lived in the same house a year earlier | 93.2% ±4.4 pts | 89.4% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Census Tract 3521 earn?
Half of the 1,739 households in Census Tract 3521 earn less than $71,250 a year (±$33,128), against $86,191 across Naugatuck Valley Planning Region: 66th highest of the county's 96 tracts with a reliable estimate. 13.9% of residents live below the poverty line.
| Measure | Tract 3521 | Waterbury |
|---|---|---|
| Median household income | $71,250 ±$33,128 | $51,886 |
| Mean household income | $89,754 ±$19,327 | $71,815 |
| Per capita income | $36,128 ±$8,683 | $29,542 |
| People below the poverty line | 13.9% ±8.1 pts | 24.7% |
| Children under 18 below the poverty line | 20.9% ±18.4 pts | 34.9% |
| Households receiving SNAP | 19.3% ±8.0 pts | 29.5% |
| Households with a computer | 91.1% ±7.7 pts | 92.1% |
| Households with a broadband subscription | 91.2% ±7.6 pts | 85.3% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Census Tract 3521?
Owners occupy 75.3% of Census Tract 3521's occupied homes and renters 24.7%. The median owner-occupied home is valued at $198,600 by its owner (±$23,333). The median renter pays $1,195 a month including utilities, and 50.9% of renters pay 35% or more of their income on rent.
| Measure | Tract 3521 | Waterbury |
|---|---|---|
| Median home value (owner-occupied) | $198,600 ±$23,333 | $208,500 |
| Median gross rent | $1,195 ±$158 | $1,225 |
| Renters paying 35% or more of income on rent | 50.9% ±25.7 pts | 50.0% |
| Median monthly owner costs, with a mortgage | $1,860 ±$90 | $1,850 |
| Owner-occupied homes | 75.3% ±10.2 pts | 47.2% |
| Renter-occupied homes | 24.7% ±10.2 pts | 52.8% |
| Housing units | 1,842 ±268 | 49,956 |
| Single-family detached homes | 56.8% ±12.0 pts | 41.2% |
| Mobile homes | 0.0% ±2.3 pts | 0.1% |
| Built 2020 or later | 0.0% ±2.3 pts | 0.3% |
| Built 2010 to 2019 | 0.0% ±2.3 pts | 1.3% |
| Built 1939 or earlier | 14.0% ±7.2 pts | 30.8% |
| Households with no vehicle | 7.3% ±6.9 pts | 18.7% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Census Tract 3521 get to work?
79.3% of Census Tract 3521's workers drive alone. The average trip to work takes 37.1 minutes.
| Measure | Tract 3521 | Waterbury |
|---|---|---|
| In the labor force (age 16+) | 61.3% ±7.6 pts | 59.7% |
| Unemployment rate | 3.3% ±2.6 pts | 9.3% |
| Drove alone to work | 79.3% ±11.1 pts | 69.8% |
| Carpooled | 8.5% ±6.1 pts | 12.7% |
| Public transportation | 4.2% ±4.7 pts | 3.9% |
| Walked | 0.0% ±2.0 pts | 2.1% |
| Worked from home | 8.0% ±8.2 pts | 8.3% |
| Mean travel time to work | 37.1 min ±7.8 | 28.0 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
How does Census Tract 3521 compare with the other tracts in Naugatuck Valley Planning Region?
Among Naugatuck Valley Planning Region's tracts with a reliable estimate, Census Tract 3521 ranks as shown below (1 = highest).
| Measure | In Naugatuck Valley Planning Region | In Waterbury |
|---|---|---|
| Population | 54th of 98 | 13th of 28 |
| Residents per square mile | 12th of 98 | 11th of 28 |
| Median household income | 66th of 96 | 6th of 26 |
| Per capita income | 70th of 97 | 5th of 27 |
| Median home value | 86th of 97 | 18th of 27 |
| Median gross rent | 71st of 88 | 21st of 28 |
| Poverty rate | 30th of 66 | 24th of 27 |
| Bachelor's degree or higher | 76th of 95 | 10th of 25 |
| Median age | 67th of 98 | 9th of 28 |
| Owner-occupied share | 47th of 96 | 4th of 26 |
The tracts next to it on Naugatuck Valley Planning Region's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 1252 | 63rd | $75,039±$27,441 · within the margin of this tract |
| Tract 3516.01 | 64th | $74,656±$26,198 · within the margin of this tract |
| Tract 3509 | 65th | $72,557±$36,038 · within the margin of this tract |
| Tract 3521 | 66th | $71,250±$33,128 |
| Tract 4052 | 67th | $71,056±$7,275 · within the margin of this tract |
| Tract 3481.25 | 68th | $68,897±$10,636 · within the margin of this tract |
| Tract 1254 | 69th | $68,288±$12,310 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 3521?
2 of the 18 figures for Census Tract 3521 on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections