City · Kentucky
Williamstown, Kentucky
Williamstown, city, in Grant County, Kentucky. Williamstown had 4,030 residents on July 1, 2025 by the Census Bureau's estimate, up 3.1% since 2020; the 2020 Census counted 3,894 and the ACS 2020-2024 5-year estimates put it at 3,945 (±15). GEOID 2183406.
Residents, July 2025 estimate
4,030
Census Bureau estimate (no margin published)
2020 Census count: 3,894 · ACS 2020-2024: 3,945 ±15
Median household income
$95,050
±$20,282 (90% margin)
Kentucky: $63,726
Median home value
$209,800
±$59,046 (90% margin)
Kentucky: $205,600
Median gross rent
$721
±$159 (90% margin)
Kentucky: $967
Where is Williamstown and what county is it in?
Williamstown is a city in Grant County, Kentucky. It covers 16.8 square miles of land, 231 residents per square mile in 2020.
Williamstown is in the Cincinnati, OH-KY-IN metropolitan statistical area, which takes in 15 counties (Census Bureau delineation, July 2023).
| County | 2020 residents | Share |
|---|---|---|
| Grant County | 3,894 | 100.0% |
| Pendleton County | land only, no residents | – |
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Williamstown, and is it growing?
The Census Bureau estimates that 4,030 people lived in Williamstown on July 1, 2025, up 3.1% since 2020, faster than Kentucky (+2.2%). The 2020 Census counted 3,894 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 3,945 (±15).
| Measure | Williamstown | Grant County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 3,945 ±15 | 25,418 | +40 |
| Households | 1,263 ±160 | 9,224 | no clear change |
| Average household size | 2.91 ±0.37 | 2.73 | no clear change |
| Housing units | 1,433 ±177 | 10,245 | no clear change |
Williamstown's population since 2000
From 3,227 in 2000 to 4,030 in 2025: up 24.9%. The 2000, 2010 and 2020 figures are census counts, each for Williamstown 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 Williamstown?
The median resident of Williamstown is 31.0 years old; 32.6% are under 18 and 10.0% are 65 or older. The largest group is non-Hispanic white residents at 94.8%, then non-Hispanic residents of two or more races at 4.9%.
| Measure | Williamstown | Grant County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 31.0 ±4.6 | 36.6 | no clear change |
| Under 18 years | 32.6% ±4.3 pts | 26.5% | – |
| 65 years and over | 10.0% ±2.8 pts | 14.5% | – |
| Male | 44.8% ±4.2 pts | 50.4% | – |
| Hispanic or Latino (any race) | 0.0% ±0.9 pts | 3.2% | – |
| White alone, not Hispanic | 94.8% ±2.4 pts | 92.2% | no clear change |
| Black or African American alone, not Hispanic | 0.3% ±0.3 pts | 0.9% | – |
| Asian alone, not Hispanic | 0.0% ±0.9 pts | 0.6% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.3 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.9 pts | 0.1% | – |
| Two or more races, not Hispanic | 4.9% ±2.3 pts | 2.9% | – |
| Some other race alone, not Hispanic | 0.0% ±0.9 pts | 0.1% | – |
| Born outside the United States | 0.1% ±0.3 pts | 1.3% | – |
| Speak a language other than English at home (age 5+) | 1.2% ±1.5 pts | 2.9% | – |
| Civilian veterans (age 18+) | 5.3% ±2.8 pts | 6.0% | – |
| With a disability | 13.8% ±4.1 pts | 16.8% | – |
| No health insurance coverage | 5.4% ±3.2 pts | 6.1% | no clear change |
| High school graduate or higher (age 25+) | 91.4% ±3.8 pts | 89.8% | – |
| Bachelor's degree or higher (age 25+) | 21.4% ±6.4 pts | 15.3% | +9.0 pts |
| Graduate or professional degree (age 25+) | 6.7% ±4.0 pts | 6.0% | – |
| Lived in the same house a year earlier | 89.4% ±4.9 pts | 93.0% | – |
| Moved from another state in the past year | 0.5% ±0.6 pts | 1.2% | – |
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 Williamstown earn?
Half of Williamstown's 1,263 households earn less than $95,050 a year (±$20,282), against $69,178 in Grant County and $63,726 in Kentucky. In 2015-2019 the median was $50,425 in 2024 dollars, so it rose by $44,625 after inflation. 7.7% of residents live below the poverty line.
| Measure | Williamstown | Grant County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $95,050 ±$20,282 | $69,178 | +$44,625 |
| Mean household income | $86,319 ±$10,015 | $81,150 | – |
| Per capita income | $28,383 ±$3,458 | $31,323 | no clear change |
| People below the poverty line | 7.7% ±4.4 pts | 11.7% | no clear change |
| Children under 18 below the poverty line | 5.7% ±6.4 pts | 12.7% | – |
| Households receiving SNAP | 15.8% ±7.7 pts | 12.2% | – |
| Households with a computer | 93.8% ±4.2 pts | 95.9% | – |
| Households with a broadband subscription | 89.9% ±5.7 pts | 88.9% | – |
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 Williamstown?
Owners occupy 75.1% of Williamstown's occupied homes and renters 24.9%. The median owner-occupied home is valued at $209,800 by its owner (±$59,046). The median renter pays $721 a month including utilities.
| Measure | Williamstown | Grant County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $209,800 ±$59,046 | $209,500 | no clear change |
| Median gross rent | $721 ±$159 | $862 | −$164 |
| Renters paying 35% or more of income on rent | 27.7% ±19.5 pts | 24.5% | – |
| Median monthly owner costs, with a mortgage | $1,293 ±$112 | $1,389 | – |
| Owner-occupied homes | 75.1% ±8.1 pts | 75.1% | no clear change |
| Renter-occupied homes | 24.9% ±8.1 pts | 24.9% | – |
| Housing units | 1,433 ±177 | 10,245 | no clear change |
| Homeowner vacancy rate | 6.5% ±8.7 pts | 1.0% | – |
| Rental vacancy rate | 14.6% ±20.5 pts | 2.4% | – |
| Single-family detached homes | 80.5% ±6.8 pts | 63.5% | – |
| Mobile homes | 4.5% ±3.9 pts | 21.9% | – |
| Built 2020 or later | 1.0% ±1.7 pts | 1.5% | – |
| Built 2010 to 2019 | 2.0% ±2.0 pts | 7.1% | – |
| Built 1939 or earlier | 11.6% ±7.2 pts | 6.0% | – |
| Households with no vehicle | 2.7% ±2.3 pts | 4.8% | – |
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 Williamstown work and get to work?
74.8% of Williamstown's workers drive alone and 10.2% work from home. The average trip to work takes 23.4 minutes.
| Measure | Williamstown | Grant County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 69.3% ±6.5 pts | 64.1% | – |
| Unemployment rate | 2.9% ±2.3 pts | 4.9% | – |
| Drove alone to work | 74.8% ±9.4 pts | 78.7% | – |
| Carpooled | 15.0% ±9.2 pts | 10.2% | – |
| Public transportation | 0.0% ±2.0 pts | 0.0% | – |
| Walked | 0.0% ±2.0 pts | 2.9% | – |
| Worked from home | 10.2% ±5.4 pts | 7.6% | – |
| Mean travel time to work | 23.4 min ±2.7 | 26.9 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 Williamstown?
No census tract lies mostly in Williamstown; 6 tracts reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9203.02Grant County | 5,713 | $78,776 |
| Tract 9203.01Grant County | 2,038 | $77,368 |
| Tract 9202.01Grant County | 2,953 | $74,922 |
| Tract 9301.02Pendleton County | 3,647 | $75,088 |
| Tract 9202.02Grant County | 4,338 | $68,803 |
| Tract 9302Pendleton County | 2,840 | $51,051 |
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 Williamstown) · Census block assignment files
How does Williamstown compare with other places in Kentucky?
By the Census Bureau's July 2025 estimates, Williamstown is the 5,490th-most populous of the 19,476 U.S. incorporated places that have one and the 92nd-most populous of 418 in Kentucky.
Williamstown ranks 36th of 230 places in Kentucky with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 92nd | 418 |
| Growth 2020-2025 (PEP) | 67th | 204 |
| Residents per square mile | 224th | 232 |
| Median household income | 36th | 230 |
| Per capita income | 127th | 232 |
| Median home value | 81st | 225 |
| Median gross rent | 154th | 217 |
| Poverty rate | 185th | 203 |
| Bachelor's degree or higher | 118th | 223 |
| Median age | 207th | 232 |
| Owner-occupied share | 55th | 229 |
| Work from home | 87th | 130 |
| Travel time to work | 90th | 232 |
Williamstown's figures with every place in Kentucky (CSV)
Every place in Kentucky, sortable · Compare Williamstown 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 Williamstown?
20 of the 57 figures for Williamstown 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 Williamstown 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 Williamstown.