City · Missouri
Union, Missouri
Union, city, in Franklin County, Missouri. Union had 13,445 residents on July 1, 2025 by the Census Bureau's estimate, up 8.9% since 2020; the 2020 Census counted 12,348 and the ACS 2020-2024 5-year estimates put it at 12,781 (±32). GEOID 2974626.
Residents, July 2025 estimate
13,445
Census Bureau estimate (no margin published)
2020 Census count: 12,348 · ACS 2020-2024: 12,781 ±32
Median household income
$73,435
±$7,625 (90% margin)
Missouri: $70,702
Median home value
$205,200
±$9,777 (90% margin)
Missouri: $230,300
Median gross rent
$858
±$53 (90% margin)
Missouri: $1,033
Where is Union and what county is it in?
Union is a city in Franklin County, Missouri. It covers 9.1 square miles of land, 1,358 residents per square mile in 2020.
Union is in the St. Louis, MO-IL 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 Union, and is it growing?
The Census Bureau estimates that 13,445 people lived in Union on July 1, 2025, up 8.9% since 2020, faster than Missouri (+1.9%). The 2020 Census counted 12,348 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 12,781 (±32).
| Measure | Union | Franklin County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 12,781 ±32 | 105,950 | +1,306 |
| Households | 4,990 ±233 | 43,036 | +549 |
| Average household size | 2.51 ±0.12 | 2.44 | no clear change |
| Housing units | 5,399 ±297 | 46,312 | +757 |
Union's population since 2000
From 7,757 in 2000 to 13,445 in 2025: up 73.3%. The 2000, 2010 and 2020 figures are census counts, each for Union 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 Union?
The median resident of Union is 33.3 years old; 26.4% are under 18 and 12.4% are 65 or older. The largest group is non-Hispanic white residents at 86.5%, then non-Hispanic residents of two or more races at 7.5%. 1.4% of residents were born outside the United States.
| Measure | Union | Franklin County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 33.3 ±2.6 | 41.8 | no clear change |
| Under 18 years | 26.4% ±2.5 pts | 22.4% | – |
| 65 years and over | 12.4% ±2.1 pts | 19.2% | – |
| Male | 51.7% ±2.3 pts | 50.1% | – |
| Hispanic or Latino (any race) | 2.5% ±1.1 pts | 2.3% | – |
| White alone, not Hispanic | 86.5% ±4.0 pts | 88.7% | −8.9 pts |
| Black or African American alone, not Hispanic | 2.2% ±1.4 pts | 0.9% | – |
| Asian alone, not Hispanic | 1.3% ±0.8 pts | 0.4% | – |
| 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% ±0.3 pts | 0.0% | – |
| Two or more races, not Hispanic | 7.5% ±3.5 pts | 7.4% | – |
| Some other race alone, not Hispanic | 0.0% ±0.1 pts | 0.2% | – |
| Born outside the United States | 1.4% ±0.8 pts | 1.4% | – |
| Speak a language other than English at home (age 5+) | 2.6% ±1.1 pts | 1.9% | – |
| Civilian veterans (age 18+) | 9.0% ±2.0 pts | 7.7% | – |
| With a disability | 12.4% ±2.3 pts | 14.4% | – |
| No health insurance coverage | 7.8% ±2.7 pts | 6.9% | no clear change |
| High school graduate or higher (age 25+) | 91.1% ±2.0 pts | 90.8% | – |
| Bachelor's degree or higher (age 25+) | 23.7% ±4.9 pts | 23.7% | no clear change |
| Graduate or professional degree (age 25+) | 6.2% ±2.4 pts | 7.9% | – |
| Lived in the same house a year earlier | 84.5% ±5.0 pts | 90.1% | – |
| Moved from another state in the past year | 3.5% ±3.5 pts | 1.5% | – |
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 Union earn?
Half of Union's 4,990 households earn less than $73,435 a year (±$7,625), against $73,165 in Franklin County and $70,702 in Missouri. In 2015-2019 the median was $64,706 in 2024 dollars, so it rose by $8,729 after inflation. 8.1% of residents live below the poverty line.
| Measure | Union | Franklin County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $73,435 ±$7,625 | $73,165 | +$8,729 |
| Mean household income | $84,927 ±$5,770 | $92,432 | – |
| Per capita income | $33,416 ±$2,207 | $37,792 | no clear change |
| People below the poverty line | 8.1% ±3.2 pts | 8.2% | no clear change |
| Children under 18 below the poverty line | 8.6% ±5.4 pts | 8.4% | no clear change |
| Households receiving SNAP | 8.3% ±2.8 pts | 7.1% | – |
| Households with a computer | 96.7% ±1.3 pts | 94.7% | – |
| Households with a broadband subscription | 94.5% ±1.7 pts | 90.0% | – |
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 Union?
Owners occupy 60.6% of Union's occupied homes and renters 39.4%. The median owner-occupied home is valued at $205,200 by its owner (±$9,777). The median renter pays $858 a month including utilities, and 17.8% of renters pay 35% or more of their income on rent.
| Measure | Union | Franklin County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $205,200 ±$9,777 | $227,600 | +$22,073 |
| Median gross rent | $858 ±$53 | $893 | no clear change |
| Renters paying 35% or more of income on rent | 17.8% ±6.5 pts | 31.6% | −14.2 pts |
| Median monthly owner costs, with a mortgage | $1,360 ±$65 | $1,442 | – |
| Owner-occupied homes | 60.6% ±4.7 pts | 76.5% | no clear change |
| Renter-occupied homes | 39.4% ±4.7 pts | 23.5% | – |
| Housing units | 5,399 ±297 | 46,312 | +757 |
| Homeowner vacancy rate | 1.6% ±2.0 pts | 0.7% | – |
| Rental vacancy rate | 10.2% ±7.1 pts | 6.4% | – |
| Single-family detached homes | 63.7% ±4.8 pts | 75.8% | – |
| Mobile homes | 7.7% ±3.6 pts | 9.0% | – |
| Built 2020 or later | 2.2% ±2.2 pts | 1.5% | – |
| Built 2010 to 2019 | 16.4% ±4.2 pts | 9.6% | – |
| Built 1939 or earlier | 8.0% ±2.5 pts | 9.9% | – |
| Households with no vehicle | 5.9% ±2.7 pts | 3.8% | – |
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 many new homes is Union building?
Builders took permits for 144 new housing units in Union in 2025 (134 in single-family houses), 10.7 per 1,000 residents against 2.8 across Missouri.
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 Union work and get to work?
79.0% of Union's workers drive alone and 9.0% work from home. The average trip to work takes 24.2 minutes.
| Measure | Union | Franklin County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 67.2% ±3.6 pts | 62.3% | – |
| Unemployment rate | 3.7% ±2.8 pts | 4.3% | – |
| Drove alone to work | 79.0% ±4.3 pts | 78.0% | – |
| Carpooled | 9.2% ±2.7 pts | 9.6% | – |
| Public transportation | 0.7% ±0.9 pts | 0.2% | – |
| Walked | 1.0% ±1.4 pts | 1.3% | – |
| Worked from home | 9.0% ±2.7 pts | 10.3% | +5.5 pts |
| Mean travel time to work | 24.2 min ±2.6 | 28.3 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 Union?
4 census tracts lie mostly in Union (2020 census blocks). Their median household incomes run from $61,295 (Tract 8006.04) to $86,875 (Tract 8006.05).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 8006.04Franklin County | 3,766 | $61,295 |
| Tract 8006.06Franklin County | 5,516 | $80,656 |
| Tract 8006.03Franklin County | 4,131 | $68,616 |
| Tract 8006.05Franklin County | 4,676 | $86,875 |
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 Union) · Census block assignment files
How does Union compare with other places in Missouri?
By the Census Bureau's July 2025 estimates, Union is the 2,603rd-most populous of the 19,476 U.S. incorporated places that have one and the 61st-most populous of 936 in Missouri.
Union ranks 109th of 416 places in Missouri with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 61st | 936 |
| Growth 2020-2025 (PEP) | 41st | 394 |
| Residents per square mile | 128th | 420 |
| Median household income | 109th | 416 |
| Per capita income | 145th | 420 |
| Median home value | 122nd | 416 |
| Median gross rent | 201st | 398 |
| Poverty rate | 301st | 373 |
| Bachelor's degree or higher | 158th | 404 |
| Median age | 347th | 420 |
| Owner-occupied share | 280th | 418 |
| Work from home | 166th | 270 |
| Travel time to work | 161st | 420 |
Union's figures with every place in Missouri (CSV)
Every place in Missouri, sortable · Compare Union 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 Union?
10 of the 57 figures for Union 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 Union 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 Union.