Borough · Pennsylvania
Williamstown, Pennsylvania
Williamstown, borough, in Dauphin County, Pennsylvania. Williamstown had 1,298 residents on July 1, 2025 by the Census Bureau's estimate, down 0.5% since 2020; the 2020 Census counted 1,303 and the ACS 2020-2024 5-year estimates put it at 1,345 (±155). GEOID 4285320.
Residents, July 2025 estimate
1,298
Census Bureau estimate (no margin published)
2020 Census count: 1,303 · ACS 2020-2024: 1,345 ±155
Median household income
$61,757
±$3,461 (90% margin)
Pennsylvania: $77,971
Median home value
$100,700
±$7,123 (90% margin)
Pennsylvania: $254,500
Median gross rent
$888
±$91 (90% margin)
Pennsylvania: $1,209
Where is Williamstown and what county is it in?
Williamstown is a borough in Dauphin County, Pennsylvania. It covers 0.3 square miles of land, 5,031 residents per square mile in 2020.
Williamstown is in the Harrisburg-Carlisle, PA metropolitan statistical area, which takes in 3 counties (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 1,298 people lived in Williamstown on July 1, 2025, down 0.5% since 2020, while Pennsylvania grew 0.4%. The 2020 Census counted 1,303 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,345 (±155).
| Measure | Williamstown | Dauphin County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,345 ±155 | 289,593 | no clear change |
| Households | 572 ±60 | 121,358 | no clear change |
| Average household size | 2.35 ±0.18 | 2.33 | no clear change |
| Housing units | 638 ±62 | 127,828 | no clear change |
Williamstown's population since 2000
From 1,433 in 2000 to 1,298 in 2025: down 9.4%. 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 36.1 years old; 28.4% are under 18 and 16.4% are 65 or older. The largest group is non-Hispanic white residents at 86.8%, then Hispanic or Latino residents (of any race) at 7.7%.
| Measure | Williamstown | Dauphin County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 36.1 ±4.8 | 39.4 | no clear change |
| Under 18 years | 28.4% ±4.0 pts | 22.3% | – |
| 65 years and over | 16.4% ±3.4 pts | 18.0% | – |
| Male | 47.0% ±3.8 pts | 48.8% | – |
| Hispanic or Latino (any race) | 7.7% ±4.9 pts | 11.8% | – |
| White alone, not Hispanic | 86.8% ±6.6 pts | 60.6% | no clear change |
| Black or African American alone, not Hispanic | 3.0% ±2.6 pts | 16.3% | – |
| Asian alone, not Hispanic | 0.0% ±2.4 pts | 6.5% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±2.4 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±2.4 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.6% ±1.9 pts | 4.1% | – |
| Some other race alone, not Hispanic | 0.0% ±2.4 pts | 0.6% | – |
| Born outside the United States | 0.4% ±0.6 pts | 9.8% | – |
| Speak a language other than English at home (age 5+) | 5.2% ±4.3 pts | 14.8% | – |
| Civilian veterans (age 18+) | 4.3% ±1.9 pts | 6.6% | – |
| With a disability | 18.7% ±4.9 pts | 14.0% | – |
| No health insurance coverage | 3.7% ±2.0 pts | 6.4% | no clear change |
| High school graduate or higher (age 25+) | 86.0% ±6.0 pts | 91.2% | – |
| Bachelor's degree or higher (age 25+) | 11.7% ±4.5 pts | 34.4% | no clear change |
| Graduate or professional degree (age 25+) | 1.8% ±1.4 pts | 12.8% | – |
| Lived in the same house a year earlier | 83.7% ±8.2 pts | 87.6% | – |
| Moved from another state in the past year | 0.5% ±0.5 pts | 2.0% | – |
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 572 households earn less than $61,757 a year (±$3,461), against $76,242 in Dauphin County and $77,971 in Pennsylvania. In 2015-2019 it was $58,678 in 2024 dollars; the margins of error cannot tell the two periods apart. 22.7% of residents live below the poverty line.
| Measure | Williamstown | Dauphin County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $61,757 ±$3,461 | $76,242 | no clear change |
| Mean household income | $66,240 ±$6,574 | $101,339 | – |
| Per capita income | $28,370 ±$3,245 | $42,294 | no clear change |
| People below the poverty line | 22.7% ±7.0 pts | 12.9% | no clear change |
| Children under 18 below the poverty line | 36.7% ±14.7 pts | 16.7% | no clear change |
| Households receiving SNAP | 22.4% ±7.1 pts | 13.3% | – |
| Households with a computer | 94.1% ±3.5 pts | 94.0% | – |
| Households with a broadband subscription | 86.7% ±6.4 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 62.6% of Williamstown's occupied homes and renters 37.4%. The median owner-occupied home is valued at $100,700 by its owner (±$7,123). The median renter pays $888 a month including utilities, and 34.0% of renters pay 35% or more of their income on rent.
| Measure | Williamstown | Dauphin County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $100,700 ±$7,123 | $236,400 | +$11,352 |
| Median gross rent | $888 ±$91 | $1,217 | no clear change |
| Renters paying 35% or more of income on rent | 34.0% ±13.2 pts | 37.8% | no clear change |
| Median monthly owner costs, with a mortgage | $1,161 ±$74 | $1,660 | – |
| Owner-occupied homes | 62.6% ±8.3 pts | 63.1% | no clear change |
| Renter-occupied homes | 37.4% ±8.3 pts | 36.9% | – |
| Housing units | 638 ±62 | 127,828 | no clear change |
| Homeowner vacancy rate | 5.4% ±5.6 pts | 0.7% | – |
| Rental vacancy rate | 0.0% ±14.1 pts | 4.2% | – |
| Single-family detached homes | 61.9% ±8.7 pts | 49.5% | – |
| Mobile homes | 2.4% ±2.7 pts | 2.6% | – |
| Built 2020 or later | 0.0% ±5.0 pts | 1.2% | – |
| Built 2010 to 2019 | 0.5% ±0.9 pts | 6.3% | – |
| Built 1939 or earlier | 63.0% ±7.2 pts | 19.1% | – |
| Households with no vehicle | 10.5% ±4.8 pts | 9.4% | – |
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 0 new housing units in Williamstown in 2025 (0 in single-family houses), 0.0 per 1,000 residents against 2.0 across Pennsylvania.
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?
64.2% of Williamstown's workers drive alone and 8.9% work from home. The average trip to work takes 31.7 minutes. The unemployment rate in 2020-2024 averaged 11.7%.
| Measure | Williamstown | Dauphin County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 57.9% ±6.3 pts | 64.6% | – |
| Unemployment rate | 11.7% ±5.0 pts | 4.5% | – |
| Drove alone to work | 64.2% ±8.9 pts | 68.5% | – |
| Carpooled | 19.7% ±8.1 pts | 8.2% | – |
| Public transportation | 0.0% ±6.0 pts | 1.3% | – |
| Walked | 7.2% ±4.8 pts | 2.8% | – |
| Worked from home | 8.9% ±4.6 pts | 16.8% | no clear change |
| Mean travel time to work | 31.7 min ±3.7 | 21.5 min | −5.8 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 Williamstown?
1 census tract lies mostly in Williamstown (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 249Dauphin County | 2,523 | $64,324 |
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 Pennsylvania?
By the Census Bureau's July 2025 estimates, Williamstown is the 9,316th-most populous of the 19,476 U.S. incorporated places that have one and the 536th-most populous of 1,012 in Pennsylvania.
Williamstown ranks 1,674th of 2,136 places in Pennsylvania with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 536th | 1,012 |
| Growth 2020-2025 (PEP) | 952nd | 1,764 |
| Residents per square mile | 139th | 2,159 |
| Median household income | 1,674th | 2,136 |
| Per capita income | 1,964th | 2,157 |
| Median home value | 2,023rd | 2,146 |
| Median gross rent | 1,365th | 1,963 |
| Poverty rate | 117th | 1,606 |
| Bachelor's degree or higher | 2,028th | 2,129 |
| Median age | 1,924th | 2,157 |
| Owner-occupied share | 1,768th | 2,149 |
| Work from home | 1,287th | 1,710 |
| Travel time to work | 297th | 2,156 |
Williamstown's figures with every place in Pennsylvania (CSV)
Every place in Pennsylvania, 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?
17 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.