Town · Massachusetts
Williamstown, Massachusetts
Williamstown, town, in Berkshire County, Massachusetts. Williamstown had 9,186 residents on July 1, 2025 by the Census Bureau's estimate, up 22.2% since 2020; the 2020 Census counted 7,513 and the ACS 2020-2024 5-year estimates put it at 9,150 (±37). GEOID 2500379985.
Residents, July 2025 estimate
9,186
Census Bureau estimate (no margin published)
2020 Census count: 7,513 · ACS 2020-2024: 9,150 ±37
Median household income
$106,650
±$25,244 (90% margin)
Massachusetts: $103,960
Median home value
$437,100
±$38,707 (90% margin)
Massachusetts: $562,100
Median gross rent
$1,584
±$292 (90% margin)
Massachusetts: $1,762
Where is Williamstown and what county is it in?
Williamstown is a town in Berkshire County, Massachusetts. It covers 46.7 square miles of land, 161 residents per square mile in 2020.
One place lies inside Williamstown: Williamstown (CDP, 4,308 in 2020).
Williamstown is in the Pittsfield, MA 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 Williamstown, and is it growing?
The Census Bureau estimates that 9,186 people lived in Williamstown on July 1, 2025, up 22.2% since 2020, faster than Massachusetts (+1.7%). The 2020 Census counted 7,513 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 9,150 (±37).
The yearly series starts from the Census Bureau's July 2020 estimate, 8,719, which differs from its April 2020 base of 7,520 (in 2020 the estimates dipped in many college and military towns), so the first step is large; the change since 2020 above is measured from the April base.
| Measure | Williamstown | Berkshire County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 9,150±37 | 129,430 | +1,636 |
| Households | 3,229±231 | 57,585 | +954 |
| Average household size | 2.11±0.15 | 2.14 | no clear change |
| Housing units | 3,739±284 | 70,004 | +777 |
Williamstown's population since 2000
From 8,424 in 2000 to 9,186 in 2025: up 9.0%. 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 37.5 years old; 15.5% are under 18 and 24.1% are 65 or older. The largest group is non-Hispanic white residents at 80.0%, then non-Hispanic Asian residents at 6.3%. 8.5% of residents were born outside the United States.
| Measure | Williamstown | Berkshire County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 37.5±6.9 | 47.3 | no clear change |
| Under 18 years | 15.5%±3.1 pts | 16.0% | – |
| 65 years and over | 24.1%±2.7 pts | 25.0% | – |
| Male | 45.7%±3.6 pts | 49.0% | – |
| Hispanic or Latino (any race) | 5.2%±1.8 pts | 5.9% | no clear change |
| White alone, not Hispanic | 80.0%±3.6 pts | 84.8% | no clear change |
| Black or African American alone, not Hispanic | 3.4%±1.7 pts | 2.6% | no clear change |
| Asian alone, not Hispanic | 6.3%±2.3 pts | 1.9% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.5 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.5 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.3%±2.1 pts | 4.3% | – |
| Some other race alone, not Hispanic | 0.9%±0.6 pts | 0.4% | – |
| Born outside the United States | 8.5%±2.0 pts | 6.2% | no clear change |
| Speak a language other than English at home (age 5+) | 12.2%±2.7 pts | 8.1% | – |
| Civilian veterans (age 18+) | 6.0%±2.0 pts | 5.9% | – |
| With a disability | 11.2%±2.6 pts | 16.0% | – |
| No health insurance coverage | 1.0%±0.7 pts | 1.7% | – |
| High school graduate or higher (age 25+) | 98.2%±1.2 pts | 94.1% | – |
| Bachelor's degree or higher (age 25+) | 70.9%±5.1 pts | 40.0% | +8.2 pts |
| Graduate or professional degree (age 25+) | 47.4%±6.2 pts | 18.7% | – |
| Lived in the same house a year earlier | 74.7%±4.5 pts | 88.7% | – |
| Moved from another state in the past year | 8.9%±2.4 pts | 3.5% | – |
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 3,229 households earn less than $106,650 a year (±$25,244), against $76,013 in Berkshire County and $103,960 in Massachusetts. In 2015-2019 it was $103,269 in 2024 dollars; the margins of error cannot tell the two periods apart. 11.2% of residents live below the poverty line.
| Measure | Williamstown | Berkshire County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $106,650±$25,244 | $76,013 | no clear change |
| Mean household income | $148,987±$27,301 | $108,456 | – |
| Per capita income | $53,332±$9,589 | $49,365 | +$12,127 |
| People below the poverty line | 11.2%±4.1 pts | 11.4% | no clear change |
| Children under 18 below the poverty line | 8.5%±7.3 pts | 16.0% | – |
| Households receiving SNAP | 5.3%±2.8 pts | 16.5% | – |
| Households with a computer | 98.2%±1.2 pts | 94.3% | – |
| Households with a broadband subscription | 92.6%±3.8 pts | 90.3% | – |
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 Williamstown?
Owners occupy 73.8% of Williamstown's occupied homes and renters 26.2%. The median owner-occupied home is valued at $437,100 by its owner (±$38,707). The median renter pays $1,584 a month including utilities, and 34.7% of renters pay 35% or more of their income on rent.
| Measure | Williamstown | Berkshire County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $437,100±$38,707 | $305,400 | no clear change |
| Median gross rent | $1,584±$292 | $1,097 | +$404 |
| Renters paying 35% or more of income on rent | 34.7%±12.1 pts | 43.6% | no clear change |
| Median monthly owner costs, with a mortgage | $2,406±$263 | $1,816 | – |
| Owner-occupied homes | 73.8%±6.1 pts | 69.9% | no clear change |
| Renter-occupied homes | 26.2%±6.1 pts | 30.1% | – |
| Housing units | 3,739±284 | 70,004 | +777 |
| Homeowner vacancy rate | 0.7%±0.7 pts | 0.6% | – |
| Rental vacancy rate | 2.6%±4.5 pts | 3.0% | – |
| Single-family detached homes | 70.6%±5.1 pts | 65.6% | – |
| Mobile homes | 1.5%±0.9 pts | 1.4% | – |
| Built 2020 or later | 2.3%±1.7 pts | 0.6% | – |
| Built 2010 to 2019 | 4.1%±2.4 pts | 2.6% | – |
| Built 1939 or earlier | 32.6%±5.1 pts | 35.5% | – |
| Households with no vehicle | 9.0%±4.3 pts | 9.6% | – |
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 Williamstown building?
Builders took permits for 5 new housing units in Williamstown in 2025 (5 in single-family houses), 0.5 per 1,000 residents against 1.7 across Massachusetts.
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 Williamstown work and get to work?
40.4% of Williamstown's workers drive alone and 27.3% work from home. The average trip to work takes 16.0 minutes. The unemployment rate in 2020-2024 averaged 2.1%.
| Measure | Williamstown | Berkshire County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 56.2%±3.2 pts | 60.5% | – |
| Unemployment rate | 2.1%±1.3 pts | 5.4% | no clear change |
| Drove alone to work | 40.4%±5.8 pts | 71.2% | – |
| Carpooled | 3.7%±2.1 pts | 7.1% | – |
| Public transportation | 0.9%±1.1 pts | 1.5% | – |
| Walked | 24.3%±5.5 pts | 4.8% | – |
| Worked from home | 27.3%±5.9 pts | 14.2% | +20.1 pts |
| Mean travel time to work | 16.0 min±2.4 | 21.2 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?
2 census tracts lie mostly in Williamstown (2020 census blocks). Their median household incomes run from $87,005 (Tract 9201.01) to $143,173 (Tract 9201.02).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9201.01Berkshire County | 5,639 | $87,005 |
| Tract 9201.02Berkshire County | 3,511 | $143,173 |
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 Massachusetts?
By the Census Bureau's July 2025 estimates, Williamstown is the 1,347th-most populous of the 16,079 U.S. towns and townships that have one and the 112th-most populous of 266 in Massachusetts.
Williamstown ranks 249th of 453 places in Massachusetts with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 112th | 266 |
| Growth 2020-2025 (PEP) | 1st | 292 |
| Residents per square mile | 409th | 461 |
| Median household income | 249th | 453 |
| Per capita income | 267th | 460 |
| Median home value | 308th | 459 |
| Median gross rent | 211th | 410 |
| Poverty rate | 64th | 338 |
| Bachelor's degree or higher | 49th | 459 |
| Median age | 422nd | 461 |
| Owner-occupied share | 305th | 460 |
| Work from home | 77th | 429 |
| Travel time to work | 448th | 459 |
Williamstown's figures with every place in Massachusetts (CSV)
Every place in Massachusetts, 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?
9 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' school search.