City · Ohio
Mason, Ohio
Mason, city, in Warren County, Ohio. Mason had 35,834 residents on July 1, 2025 by the Census Bureau's estimate, up 3.0% since 2020; the 2020 Census counted 34,792 and the ACS 2020-2024 5-year estimates put it at 35,509 (±55). GEOID 3948188.
Residents, July 2025 estimate
35,834
Census Bureau estimate (no margin published)
2020 Census count: 34,792 · ACS 2020-2024: 35,509 ±55
Median household income
$125,401
±$9,682 (90% margin)
Ohio: $71,389
Median home value
$426,200
±$28,995 (90% margin)
Ohio: $214,800
Median gross rent
$1,760
±$120 (90% margin)
Ohio: $1,034
Where is Mason and what county is it in?
Mason is a city in Warren County, Ohio. It covers 19.5 square miles of land, 1,786 residents per square mile in 2020.
Mason is in the Cincinnati, OH-KY-IN metropolitan statistical area, which takes in 15 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 Mason, and is it growing?
The Census Bureau estimates that 35,834 people lived in Mason on July 1, 2025, up 3.0% since 2020, faster than Ohio (+0.9%). The 2020 Census counted 34,792 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 35,509 (±55).
| Measure | Mason | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 35,509 ±55 | 250,008 | +2,285 |
| Households | 13,502 ±536 | 92,052 | +1,019 |
| Average household size | 2.60 ±0.10 | 2.66 | no clear change |
| Housing units | 13,866 ±530 | 96,061 | +1,127 |
Mason's population since 2000
From 22,016 in 2000 to 35,834 in 2025: up 62.8%. The 2000, 2010 and 2020 figures are census counts, each for Mason 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 Mason?
The median resident of Mason is 42.4 years old; 24.3% are under 18 and 15.9% are 65 or older. The largest group is non-Hispanic white residents at 74.0%, then non-Hispanic Asian residents at 14.0%. 17.1% of residents were born outside the United States.
| Measure | Mason | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 42.4 ±1.5 | 40.1 | no clear change |
| Under 18 years | 24.3% ±2.5 pts | 23.8% | – |
| 65 years and over | 15.9% ±1.8 pts | 15.8% | – |
| Male | 49.2% ±1.7 pts | 50.6% | – |
| Hispanic or Latino (any race) | 3.9% ±1.4 pts | 3.5% | no clear change |
| White alone, not Hispanic | 74.0% ±2.8 pts | 81.8% | −5.9 pts |
| Black or African American alone, not Hispanic | 5.0% ±1.4 pts | 3.2% | +2.6 pts |
| Asian alone, not Hispanic | 14.0% ±2.0 pts | 7.2% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.7% ±0.8 pts | 3.6% | – |
| Some other race alone, not Hispanic | 0.4% ±0.4 pts | 0.7% | – |
| Born outside the United States | 17.1% ±2.4 pts | 9.1% | +4.8 pts |
| Speak a language other than English at home (age 5+) | 19.8% ±2.7 pts | 10.8% | – |
| Civilian veterans (age 18+) | 5.8% ±1.0 pts | 6.7% | – |
| With a disability | 8.8% ±1.6 pts | 10.5% | – |
| No health insurance coverage | 3.1% ±1.0 pts | 3.9% | no clear change |
| High school graduate or higher (age 25+) | 96.7% ±0.9 pts | 95.1% | – |
| Bachelor's degree or higher (age 25+) | 60.4% ±3.2 pts | 45.6% | no clear change |
| Graduate or professional degree (age 25+) | 25.4% ±3.3 pts | 18.4% | – |
| Lived in the same house a year earlier | 88.8% ±2.6 pts | 90.0% | – |
| Moved from another state in the past year | 1.8% ±1.5 pts | 1.9% | – |
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 Mason earn?
Half of Mason's 13,502 households earn less than $125,401 a year (±$9,682), against $110,132 in Warren County and $71,389 in Ohio. In 2015-2019 it was $123,800 in 2024 dollars; the margins of error cannot tell the two periods apart. 3.6% of residents live below the poverty line.
| Measure | Mason | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $125,401 ±$9,682 | $110,132 | no clear change |
| Mean household income | $167,491 ±$12,814 | $145,195 | – |
| Per capita income | $64,784 ±$5,786 | $53,621 | no clear change |
| People below the poverty line | 3.6% ±1.3 pts | 6.0% | no clear change |
| Children under 18 below the poverty line | 2.9% ±2.5 pts | 6.5% | – |
| Households receiving SNAP | 2.3% ±1.2 pts | 4.6% | – |
| Households with a computer | 98.0% ±0.9 pts | 97.5% | – |
| Households with a broadband subscription | 96.3% ±1.5 pts | 94.9% | – |
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 Mason?
Owners occupy 80.1% of Mason's occupied homes and renters 19.9%. The median owner-occupied home is valued at $426,200 by its owner (±$28,995). The median renter pays $1,760 a month including utilities, and 19.3% of renters pay 35% or more of their income on rent.
| Measure | Mason | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $426,200 ±$28,995 | $349,400 | +$97,236 |
| Median gross rent | $1,760 ±$120 | $1,361 | no clear change |
| Renters paying 35% or more of income on rent | 19.3% ±8.2 pts | 32.4% | no clear change |
| Median monthly owner costs, with a mortgage | $2,353 ±$197 | $1,974 | – |
| Owner-occupied homes | 80.1% ±2.6 pts | 79.4% | no clear change |
| Renter-occupied homes | 19.9% ±2.6 pts | 20.6% | – |
| Housing units | 13,866 ±530 | 96,061 | +1,127 |
| Homeowner vacancy rate | 0.0% ±0.3 pts | 0.4% | – |
| Rental vacancy rate | 5.2% ±4.6 pts | 5.4% | – |
| Single-family detached homes | 69.2% ±3.0 pts | 76.6% | – |
| Mobile homes | 1.3% ±1.0 pts | 1.0% | – |
| Built 2020 or later | 1.1% ±0.7 pts | 3.2% | – |
| Built 2010 to 2019 | 15.5% ±2.6 pts | 13.8% | – |
| Built 1939 or earlier | 1.7% ±0.8 pts | 5.6% | – |
| Households with no vehicle | 3.7% ±1.5 pts | 3.1% | – |
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 Mason building?
Builders took permits for 101 new housing units in Mason in 2025 (85 in single-family houses), 2.8 per 1,000 residents against 2.8 across Ohio.
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 Mason work and get to work?
70.6% of Mason's workers drive alone and 23.4% work from home. The average trip to work takes 25.1 minutes. The unemployment rate in 2020-2024 averaged 2.0%.
| Measure | Mason | Warren County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 67.9% ±2.9 pts | 66.1% | – |
| Unemployment rate | 2.0% ±1.2 pts | 3.1% | no clear change |
| Drove alone to work | 70.6% ±3.5 pts | 73.7% | – |
| Carpooled | 4.8% ±1.3 pts | 5.9% | – |
| Public transportation | 0.3% ±0.3 pts | 0.1% | – |
| Walked | 0.1% ±0.1 pts | 0.6% | – |
| Worked from home | 23.4% ±3.4 pts | 18.6% | +13.9 pts |
| Mean travel time to work | 25.1 min ±1.6 | 25.3 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 Mason?
5 census tracts lie mostly in Mason, and 6 more reach into it (2020 census blocks). Their median household incomes run from $108,296 (Tract 319.05) to $167,131 (Tract 319.08).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 319.07Warren County | 13,627 | $166,895 |
| Tract 319.04Warren County | 6,727 | $117,972 |
| Tract 319.05Warren County | 6,180 | $108,296 |
| Tract 319.06Warren County | 4,421 | $113,417 |
| Tract 319.08Warren County | 4,984 | $167,131 |
| Tract 320.08Warren County | 4,495 | $151,283 |
| Tract 321Warren County | 10,289 | $128,125 |
| Tract 320.09Warren County | 8,766 | $125,068 |
| Tract 320.03Warren County | 7,751 | $94,922 |
| Tract 320.04Warren County | 5,879 | $146,597 |
| Tract 316.01Warren County | 1,469 | $130,375 |
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 Mason) · Census block assignment files
How does Mason compare with other places in Ohio?
By the Census Bureau's July 2025 estimates, Mason is the 1,146th-most populous of the 19,476 U.S. incorporated places that have one and the 39th-most populous of 923 in Ohio.
Mason ranks 95th of 1,699 places in Ohio with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 39th | 923 |
| Growth 2020-2025 (PEP) | 260th | 1,589 |
| Residents per square mile | 284th | 1,734 |
| Median household income | 95th | 1,699 |
| Per capita income | 81st | 1,729 |
| Median home value | 66th | 1,707 |
| Median gross rent | 42nd | 1,453 |
| Poverty rate | 1,063rd | 1,116 |
| Bachelor's degree or higher | 75th | 1,613 |
| Median age | 796th | 1,727 |
| Owner-occupied share | 849th | 1,732 |
| Work from home | 79th | 990 |
| Travel time to work | 776th | 1,731 |
Mason's figures with every place in Ohio (CSV)
Every place in Ohio, sortable · Compare Mason 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 Mason?
10 of the 57 figures for Mason 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 Mason 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 Mason.