Town · Connecticut
Seymour, Connecticut
Seymour, town, in Naugatuck Valley Planning Region, Connecticut. Seymour had 17,153 residents on July 1, 2025 by the Census Bureau's estimate, up 2.4% since 2020; the 2020 Census counted 16,748 and the ACS 2020-2024 5-year estimates put it at 16,889 (±24). GEOID 0914067610.
Residents, July 2025 estimate
17,153
Census Bureau estimate (no margin published)
2020 Census count: 16,748 · ACS 2020-2024: 16,889 ±24
Median household income
$107,708
±$14,986 (90% margin)
Connecticut: $95,781
Median home value
$370,000
±$19,407 (90% margin)
Connecticut: $366,900
Median gross rent
$1,608
±$86 (90% margin)
Connecticut: $1,488
Where is Seymour and what county is it in?
Seymour is a town in Naugatuck Valley Planning Region, Connecticut. It covers 14.5 square miles of land, 1,154 residents per square mile in 2020.
Seymour 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 Seymour, and is it growing?
The Census Bureau estimates that 17,153 people lived in Seymour on July 1, 2025, up 2.4% since 2020, in line with Connecticut (+2.2%). The 2020 Census counted 16,748 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 16,889 (±24).
| Measure | Seymour | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Total population | 16,889±24 | 454,969 | – |
| Households | 6,378±373 | 180,116 | – |
| Average household size | 2.62±0.15 | 2.49 | – |
| Housing units | 6,551±366 | 192,551 | – |
Seymour's population since 2000
From 15,454 in 2000 to 17,153 in 2025: up 11.0%. The 2000, 2010 and 2020 figures are census counts, each for Seymour 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 Seymour?
The median resident of Seymour is 41.6 years old; 19.3% are under 18 and 16.8% are 65 or older. The largest group is non-Hispanic white residents at 63.2%, then Hispanic or Latino residents (of any race) at 16.8%. 12.0% of residents were born outside the United States.
| Measure | Seymour | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median age | 41.6±3.0 | 41.8 | – |
| Under 18 years | 19.3%±2.1 pts | 20.3% | – |
| 65 years and over | 16.8%±2.3 pts | 19.2% | – |
| Male | 48.9%±2.6 pts | 48.9% | – |
| Hispanic or Latino (any race) | 16.8%±3.6 pts | 19.9% | – |
| White alone, not Hispanic | 63.2%±6.7 pts | 59.8% | – |
| Black or African American alone, not Hispanic | 11.3%±5.0 pts | 10.6% | – |
| Asian alone, not Hispanic | 2.2%±1.1 pts | 3.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.3 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1%±0.2 pts | 0.0% | – |
| Two or more races, not Hispanic | 6.1%±2.5 pts | 5.0% | – |
| Some other race alone, not Hispanic | 0.4%±0.5 pts | 0.9% | – |
| Born outside the United States | 12.0%±3.0 pts | 14.2% | – |
| Speak a language other than English at home (age 5+) | 15.6%±3.8 pts | 23.3% | – |
| Civilian veterans (age 18+) | 4.3%±1.2 pts | 5.0% | – |
| With a disability | 12.3%±2.7 pts | 13.8% | – |
| No health insurance coverage | 6.2%±1.9 pts | 4.8% | – |
| High school graduate or higher (age 25+) | 92.5%±2.7 pts | 90.5% | – |
| Bachelor's degree or higher (age 25+) | 33.3%±3.6 pts | 33.8% | – |
| Graduate or professional degree (age 25+) | 15.5%±2.8 pts | 14.5% | – |
| Lived in the same house a year earlier | 90.0%±3.2 pts | 90.5% | – |
| Moved from another state in the past year | 1.5%±1.5 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 Seymour earn?
Half of Seymour's 6,378 households earn less than $107,708 a year (±$14,986), against $86,191 in Naugatuck Valley Planning Region and $95,781 in Connecticut. 6.7% of residents live below the poverty line.
| Measure | Seymour | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $107,708±$14,986 | $86,191 | – |
| Mean household income | $127,008±$10,884 | $114,324 | – |
| Per capita income | $48,586±$3,620 | $46,363 | – |
| People below the poverty line | 6.7%±2.4 pts | 11.2% | – |
| Children under 18 below the poverty line | 6.9%±5.9 pts | 15.8% | – |
| Households receiving SNAP | 12.3%±3.5 pts | 14.5% | – |
| Households with a computer | 97.0%±1.4 pts | 94.8% | – |
| Households with a broadband subscription | 92.0%±3.6 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 Seymour?
Owners occupy 74.2% of Seymour's occupied homes and renters 25.8%. The median owner-occupied home is valued at $370,000 by its owner (±$19,407). The median renter pays $1,608 a month including utilities, and 39.1% of renters pay 35% or more of their income on rent.
| Measure | Seymour | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $370,000±$19,407 | $317,700 | – |
| Median gross rent | $1,608±$86 | $1,330 | – |
| Renters paying 35% or more of income on rent | 39.1%±14.7 pts | 44.4% | – |
| Median monthly owner costs, with a mortgage | $2,429±$204 | $2,229 | – |
| Owner-occupied homes | 74.2%±5.6 pts | 68.6% | – |
| Renter-occupied homes | 25.8%±5.6 pts | 31.4% | – |
| Housing units | 6,551±366 | 192,551 | – |
| Homeowner vacancy rate | 0.8%±1.0 pts | 1.0% | – |
| Rental vacancy rate | 0.5%±0.9 pts | 4.3% | – |
| Single-family detached homes | 65.9%±5.0 pts | 59.0% | – |
| Mobile homes | 0.6%±0.9 pts | 0.8% | – |
| Built 2020 or later | 0.0%±0.6 pts | 0.6% | – |
| Built 2010 to 2019 | 3.5%±1.7 pts | 3.3% | – |
| Built 1939 or earlier | 12.2%±3.1 pts | 19.3% | – |
| Households with no vehicle | 6.9%±4.3 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 Seymour building?
Builders took permits for 6 new housing units in Seymour in 2025 (4 in single-family houses), 0.3 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 Seymour work and get to work?
74.4% of Seymour's workers drive alone and 16.4% work from home. The average trip to work takes 32.0 minutes. The unemployment rate in 2020-2024 averaged 5.1%.
| Measure | Seymour | Naugatuck Valley Planning Region | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 69.2%±3.0 pts | 65.1% | – |
| Unemployment rate | 5.1%±2.1 pts | 6.0% | – |
| Drove alone to work | 74.4%±3.5 pts | 74.3% | – |
| Carpooled | 6.5%±1.9 pts | 8.8% | – |
| Public transportation | 0.5%±0.6 pts | 1.4% | – |
| Walked | 1.6%±1.5 pts | 1.3% | – |
| Worked from home | 16.4%±3.2 pts | 12.7% | – |
| Mean travel time to work | 32.0 min±3.8 | 28.3 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
What census tracts are in Seymour?
4 census tracts lie mostly in Seymour (2020 census blocks). Their median household incomes run from $81,654 (Tract 1301.01) to $169,306 (Tract 1302.01).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 1301.01Naugatuck Valley Planning Region | 5,104 | $81,654 |
| Tract 1302.02Naugatuck Valley Planning Region | 4,176 | $90,119 |
| Tract 1302.01Naugatuck Valley Planning Region | 3,890 | $169,306 |
| Tract 1301.02Naugatuck Valley Planning Region | 3,719 | $104,063 |
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 Seymour) · Census block assignment files
How does Seymour compare with other places in Connecticut?
By the Census Bureau's July 2025 estimates, Seymour is the 715th-most populous of the 16,079 U.S. towns and townships that have one and the 46th-most populous of 142 in Connecticut.
Seymour ranks 158th 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 | 46th | 142 |
| Growth 2020-2025 (PEP) | 75th | 167 |
| Residents per square mile | 124th | 303 |
| Median household income | 158th | 294 |
| Per capita income | 217th | 303 |
| Median home value | 154th | 300 |
| Median gross rent | 108th | 266 |
| Poverty rate | 97th | 202 |
| Bachelor's degree or higher | 227th | 297 |
| Median age | 215th | 301 |
| Owner-occupied share | 189th | 300 |
| Work from home | 149th | 279 |
| Travel time to work | 60th | 302 |
Seymour's figures with every place in Connecticut (CSV)
Every place in Connecticut, sortable · Compare Seymour 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 Seymour?
11 of the 57 figures for Seymour 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 Seymour 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' school search.