County · Missouri
Warren County, Missouri
Warren County, Missouri. Warren County had 39,016 residents in 2025 by the Census Bureau's estimate, up 9.8% since 2020, faster than Missouri (+1.9%). It holds 8 places (8 cities, villages and boroughs) and 9 census tracts. GEOID 29219.
Warren County is one of the 15 counties of the St. Louis, MO-IL metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
39,016
Census Bureau estimate (no margin published)
2020 Census count: 35,532 · ACS 2020-2024: 37,177
Median household income
$81,209
±$5,304 (90% margin)
Missouri: $70,702
Median home value
$260,400
±$11,232 (90% margin)
Missouri: $230,300
Median gross rent
$995
±$130 (90% margin)
Missouri: $1,033
How many people live in Warren County, and is it growing?
The 2020 Census counted 35,532 residents in Warren County. The Census Bureau estimates 39,016 for July 1, 2025, up 9.8% since 2020, faster than Missouri (+1.9%). The 2020-2024 American Community Survey puts the population at 37,177 over 429 square miles of land.
| Measure | Warren County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Total population | 37,177 | 6,191,814 | +2,724 |
| Households | 13,845±329 | 2,508,227 | +1,191 |
| Average household size | 2.67±0.06 | 2.40 | no clear change |
| Housing units | 16,161±48 | 2,825,287 | +659 |
Warren County's population since 2000
From 24,525 in 2000 to 39,016 in 2025: up 59.1%. The 2000, 2010 and 2020 figures are census counts. 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); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Warren County?
Warren County holds 8 places: 8 cities, villages and boroughs (incorporated places). The largest is Warrenton with 9,667 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Warrenton | 8,429 | $61,031 |
|---|---|---|
| Wright City | 4,881 | $80,152 |
| Marthasville | 1,245 | $112,083 |
| Truesdale | 853 | $58,750 |
| InnsbrookGEOID 2935240 | 596 | $150,833 |
| ForistellGEOID 2925120 | 550 | $116,581 |
| PendletonGEOID 2956882 | 34 | $111,250 |
| Three CreeksGEOID 2973127 | 8 | not published |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Warren County?
The median resident of Warren County is 40.8 years old; 23.1% are under 18 and 18.2% are 65 or older. The largest group is non-Hispanic white residents at 89.4%, then non-Hispanic residents of two or more races at 4.7%. 1.0% of residents were born outside the United States.
| Measure | Warren County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Median age | 40.8±0.7 | 39.0 | no clear change |
| Under 18 years | 23.1%±0.1 pts | 22.3% | – |
| 65 years and over | 18.2%±0.2 pts | 17.9% | – |
| Hispanic or Latino (any race) | 4.1% | 5.2% | +0.7 pts |
| White alone, not Hispanic | 89.4%±1.0 pts | 76.3% | −2.3 pts |
| Black or African American alone, not Hispanic | 1.1%±0.5 pts | 10.9% | −0.9 pts |
| Asian alone, not Hispanic | 0.4%±0.2 pts | 2.1% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 4.7%±1.2 pts | 4.8% | – |
| Some other race alone, not Hispanic | 0.1%±0.1 pts | 0.4% | – |
| Born outside the United States | 1.0%±0.4 pts | 4.5% | no clear change |
| Speak a language other than English at home (age 5+) | 2.8%±0.8 pts | 6.7% | – |
| Civilian veterans (age 18+) | 9.2%±1.2 pts | 7.3% | – |
| With a disability | 14.5%±1.7 pts | 14.9% | – |
| No health insurance coverage | 7.4%±2.0 pts | 8.8% | no clear change |
| High school graduate or higher (age 25+) | 90.5%±1.6 pts | 91.9% | – |
| Bachelor's degree or higher (age 25+) | 20.2%±1.8 pts | 32.4% | no clear change |
| Graduate or professional degree (age 25+) | 5.7%±1.1 pts | 12.6% | – |
| Moved from another state in the past year | 2.9%±1.2 pts | 2.5% | – |
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 Warren County earn?
Half of Warren County's 13,845 households earn less than $81,209 a year (±$5,304), against $70,702 in Missouri. In 2015-2019 the median was $73,995 in 2024 dollars, so it rose by $7,214 after inflation. 8.0% of residents live below the poverty line.
| Measure | Warren County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $81,209±$5,304 | $70,702 | +$7,214 |
| Mean household income | $99,746±$4,986 | $96,247 | – |
| Per capita income | $37,271±$1,775 | $39,695 | no clear change |
| People below the poverty line | 8.0%±1.5 pts | 12.6% | −5.4 pts |
| Children under 18 below the poverty line | 9.1%±4.2 pts | 15.8% | −14.4 pts |
| Households receiving SNAP | 6.9%±1.4 pts | 9.8% | – |
| Households with a broadband subscription | 91.8%±1.6 pts | 89.3% | – |
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 Warren County?
Owners occupy 80.2% of Warren County's occupied homes and renters 19.8%. The median owner-occupied home is valued at $260,400 by its owner (±$11,232). The median renter pays $995 a month including utilities, and 31.2% of renters pay 35% or more of their income on rent.
| Measure | Warren County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $260,400±$11,232 | $230,300 | +$38,875 |
| Median gross rent | $995±$130 | $1,033 | no clear change |
| Renters paying 35% or more of income on rent | 31.2%±8.1 pts | 36.6% | no clear change |
| Median monthly owner costs, with a mortgage | $1,485±$54 | $1,524 | – |
| Owner-occupied homes | 80.2%±2.6 pts | 68.1% | no clear change |
| Housing units | 16,161±48 | 2,825,287 | +659 |
| Homeowner vacancy rate | 0.7%±0.9 pts | 0.9% | – |
| Rental vacancy rate | 5.2%±2.9 pts | 5.0% | – |
| Single-family detached homes | 79.0%±2.6 pts | 70.5% | – |
| Mobile homes | 10.0%±1.6 pts | 5.2% | – |
| Built 2020 or later | 5.6%±1.9 pts | 1.6% | – |
| Built 1939 or earlier | 4.9%±1.4 pts | 13.3% | – |
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 Warren County building?
Builders took permits for 360 new housing units across Warren County in 2025 (313 single-family), 9.2 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Warren County get to work?
80.5% of Warren County's workers drive alone and 9.0% work from home. The average trip to work takes 31.6 minutes. The unemployment rate in 2020-2024 averaged 3.7%.
| Measure | Warren County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 62.8%±1.8 pts | 63.1% | – |
| Unemployment rate | 3.7%±1.3 pts | 4.0% | no clear change |
| Drove alone to work | 80.5%±2.1 pts | 74.8% | – |
| Carpooled | 9.5%±1.8 pts | 8.1% | – |
| Public transportation | 0.2%±0.2 pts | 0.8% | – |
| Walked | 0.4%±0.3 pts | 1.8% | – |
| Worked from home | 9.0%±1.7 pts | 13.0% | +6.6 pts |
| Mean travel time to work | 31.6 min±1.5 | 23.5 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 are Warren County's census tracts?
Warren County is divided into 9 census tracts. Among those with a reliable estimate, median household income runs from $48,482 (Tract 8201.07) to $109,531 (Tract 8202.01).
| Tract 8201.0429219820104 | 4,510±529 | $64,858 |
|---|---|---|
| Tract 8201.0529219820105 | 3,761±584 | $83,056 |
| Tract 8201.0629219820106 | 5,373±585 | $82,704 |
| Tract 8201.0729219820107 | 3,361±410 | $48,482 |
| Tract 8201.0829219820108 | 4,933±509 | $84,698 |
| Tract 8201.0929219820109 | 4,117±525 | $81,206 |
| Tract 8202.0129219820201 | 2,589±449 | $109,531 |
| Tract 8202.0329219820203 | 4,030±536 | $88,218 |
| Tract 8202.0429219820204 | 4,503±799 | $101,111 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Warren County compare with Missouri's other counties?
| Measure | Rank |
|---|---|
| Population | 32nd of 115 |
| Growth 2020-2025 | 3rd of 115 |
| Residents per square mile | 23rd of 115 |
| Median household income | 9th of 115 |
| Median home value | 9th of 115 |
| Median gross rent | 12th of 115 |
| Poverty rate | 110th of 115 |
| Bachelor's degree or higher | 43rd of 115 |
| Median age | 61st of 115 |
Source: PlainCities ranks 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 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 Warren County 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.