City · Connecticut
Ansonia, Connecticut
Ansonia, city, in Naugatuck Valley Planning Region, Connecticut. Ansonia had 19,216 residents on July 1, 2025 by the Census Bureau's estimate, up 1.6% since 2020; the 2020 Census counted 18,918 and the ACS 2020-2024 5-year estimates put it at 19,033 (±61). GEOID 0901150.
Residents, July 2025 estimate
19,216
Census Bureau estimate (no margin published)
2020 Census count: 18,918 · ACS 2020-2024: 19,033 ±61
Median household income
$85,877
±$9,841 (90% margin)
Connecticut: $95,781
Median home value
$287,200
±$14,207 (90% margin)
Connecticut: $366,900
Median gross rent
$1,476
±$121 (90% margin)
Connecticut: $1,488
Where is Ansonia and what county is it in?
Ansonia is a city in Naugatuck Valley Planning Region, Connecticut. It covers 6.0 square miles of land, 3,143 residents per square mile in 2020.
Ansonia is in the Waterbury-Shelton, CT metropolitan statistical area (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Ansonia, and is it growing?
The Census Bureau estimates that 19,216 people lived in Ansonia on July 1, 2025, up 1.6% since 2020, slower than Connecticut (+2.2%). The 2020 Census counted 18,918 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 19,033 (±61).
| Measure | Ansonia | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Total population | 19,033 ±61 | 454,969 | +231 |
| Households | 7,212 ±480 | 180,116 | no clear change |
| Average household size | 2.64 ±0.17 | 2.49 | +0.24 |
| Housing units | 7,932 ±519 | 192,551 | −796 |
Ansonia's population since 2000
From 18,554 in 2000 to 19,216 in 2025: up 3.6%. The 2000, 2010 and 2020 figures are census counts, each for Ansonia as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Ansonia?
The median resident of Ansonia is 40.1 years old; 18.3% are under 18 and 18.1% are 65 or older. The largest group is non-Hispanic white residents at 52.6%, then Hispanic or Latino residents (of any race) at 27.7%. 20.1% of residents were born outside the United States.
| Measure | Ansonia | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median age | 40.1 ±1.6 | 41.8 | no clear change |
| Under 18 years | 18.3% ±2.7 pts | 20.3% | – |
| 65 years and over | 18.1% ±2.6 pts | 19.2% | – |
| Male | 48.5% ±2.8 pts | 48.9% | – |
| Hispanic or Latino (any race) | 27.7% ±4.5 pts | 19.9% | +6.3 pts |
| White alone, not Hispanic | 52.6% ±5.0 pts | 59.8% | −8.7 pts |
| Black or African American alone, not Hispanic | 13.1% ±3.9 pts | 10.6% | no clear change |
| Asian alone, not Hispanic | 2.0% ±1.4 pts | 3.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.2 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.2% ±2.0 pts | 5.0% | – |
| Some other race alone, not Hispanic | 0.3% ±0.4 pts | 0.9% | – |
| Born outside the United States | 20.1% ±4.0 pts | 14.2% | +8.7 pts |
| Speak a language other than English at home (age 5+) | 30.4% ±5.0 pts | 23.3% | – |
| Civilian veterans (age 18+) | 4.8% ±1.5 pts | 5.0% | – |
| With a disability | 11.8% ±2.5 pts | 13.8% | – |
| No health insurance coverage | 7.4% ±2.4 pts | 4.8% | no clear change |
| High school graduate or higher (age 25+) | 89.6% ±2.6 pts | 90.5% | – |
| Bachelor's degree or higher (age 25+) | 21.9% ±2.4 pts | 33.8% | no clear change |
| Graduate or professional degree (age 25+) | 8.9% ±2.3 pts | 14.5% | – |
| Lived in the same house a year earlier | 92.2% ±2.5 pts | 90.5% | – |
| Moved from another state in the past year | 0.4% ±0.6 pts | 1.7% | – |
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 Ansonia earn?
Half of Ansonia's 7,212 households earn less than $85,877 a year (±$9,841), against $86,191 in Naugatuck Valley Planning Region and $95,781 in Connecticut. In 2015-2019 the median was $67,566 in 2024 dollars, so it rose by $18,311 after inflation. 9.4% of residents live below the poverty line.
| Measure | Ansonia | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $85,877 ±$9,841 | $86,191 | +$18,311 |
| Mean household income | $120,861 ±$22,167 | $114,324 | – |
| Per capita income | $48,209 ±$8,697 | $46,363 | +$11,091 |
| People below the poverty line | 9.4% ±2.7 pts | 11.2% | no clear change |
| Children under 18 below the poverty line | 10.0% ±6.6 pts | 15.8% | – |
| Households receiving SNAP | 15.4% ±4.2 pts | 14.5% | – |
| Households with a computer | 95.5% ±2.1 pts | 94.8% | – |
| Households with a broadband subscription | 91.5% ±2.8 pts | 90.8% | – |
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 Ansonia?
Owners occupy 58.1% of Ansonia's occupied homes and renters 41.9%. The median owner-occupied home is valued at $287,200 by its owner (±$14,207). The median renter pays $1,476 a month including utilities, and 29.7% of renters pay 35% or more of their income on rent.
| Measure | Ansonia | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $287,200 ±$14,207 | $317,700 | +$23,585 |
| Median gross rent | $1,476 ±$121 | $1,330 | no clear change |
| Renters paying 35% or more of income on rent | 29.7% ±8.5 pts | 44.4% | −20.7 pts |
| Median monthly owner costs, with a mortgage | $2,230 ±$145 | $2,229 | – |
| Owner-occupied homes | 58.1% ±5.3 pts | 68.6% | no clear change |
| Renter-occupied homes | 41.9% ±5.3 pts | 31.4% | – |
| Housing units | 7,932 ±519 | 192,551 | −796 |
| Homeowner vacancy rate | 1.5% ±1.4 pts | 1.0% | – |
| Rental vacancy rate | 3.3% ±2.8 pts | 4.3% | – |
| Single-family detached homes | 48.2% ±5.0 pts | 59.0% | – |
| Mobile homes | 0.1% ±0.2 pts | 0.8% | – |
| Built 2020 or later | 0.0% ±0.5 pts | 0.6% | – |
| Built 2010 to 2019 | 1.9% ±1.3 pts | 3.3% | – |
| Built 1939 or earlier | 34.7% ±4.9 pts | 19.3% | – |
| Households with no vehicle | 6.8% ±2.7 pts | 9.1% | – |
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 many new homes is Ansonia building?
Builders took permits for 3 new housing units in Ansonia in 2025 (3 in single-family houses), 0.2 per 1,000 residents against 2.0 across Connecticut.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Ansonia work and get to work?
71.6% of Ansonia's workers drive alone and 9.1% work from home. The average trip to work takes 26.8 minutes. The unemployment rate in 2020-2024 averaged 9.1%.
| Measure | Ansonia | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 69.3% ±4.1 pts | 65.1% | – |
| Unemployment rate | 9.1% ±2.5 pts | 6.0% | no clear change |
| Drove alone to work | 71.6% ±3.8 pts | 74.3% | – |
| Carpooled | 15.0% ±3.3 pts | 8.8% | – |
| Public transportation | 1.1% ±1.1 pts | 1.4% | – |
| Walked | 1.3% ±1.2 pts | 1.3% | – |
| Worked from home | 9.1% ±3.0 pts | 12.7% | +7.0 pts |
| Mean travel time to work | 26.8 min ±3.9 | 28.3 min | no clear change |
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 census tracts are in Ansonia?
4 census tracts lie mostly in Ansonia (2020 census blocks). Their median household incomes run from $68,288 (Tract 1254) to $98,028 (Tract 1251).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 1252Naugatuck Valley Planning Region | 5,616 | $75,039 |
| Tract 1253Naugatuck Valley Planning Region | 5,515 | $91,958 |
| Tract 1251Naugatuck Valley Planning Region | 4,237 | $98,028 |
| Tract 1254Naugatuck Valley Planning Region | 3,665 | $68,288 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Ansonia) · Census block assignment files
How does Ansonia compare with other places in Connecticut?
By the Census Bureau's July 2025 estimates, Ansonia is the 2,002nd-most populous of the 19,476 U.S. incorporated places that have one and the 19th-most populous of 30 in Connecticut.
Ansonia ranks 227th of 294 places in Connecticut with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 19th | 30 |
| Growth 2020-2025 (PEP) | 111th | 167 |
| Residents per square mile | 31st | 303 |
| Median household income | 227th | 294 |
| Per capita income | 221st | 303 |
| Median home value | 232nd | 300 |
| Median gross rent | 127th | 266 |
| Poverty rate | 59th | 202 |
| Bachelor's degree or higher | 274th | 297 |
| Median age | 240th | 301 |
| Owner-occupied share | 258th | 300 |
| Work from home | 250th | 279 |
| Travel time to work | 162nd | 302 |
Ansonia's figures with every place in Connecticut (CSV)
Every place in Connecticut, sortable · Compare Ansonia with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Ansonia?
13 of the 57 figures for Ansonia 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.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. 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 · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Ansonia are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Ansonia.