City · Kentucky
Union, Kentucky
Union, city, in Boone County, Kentucky. Union had 7,937 residents on July 1, 2025 by the Census Bureau's estimate, up 6.9% since 2020; the 2020 Census counted 7,416 and the ACS 2020-2024 5-year estimates put it at 7,642 (±21). GEOID 2178384.
Residents, July 2025 estimate
7,937
Census Bureau estimate (no margin published)
2020 Census count: 7,416 · ACS 2020-2024: 7,642 ±21
Median household income
$136,712
±$9,203 (90% margin)
Kentucky: $63,726
Median home value
$411,500
±$26,530 (90% margin)
Kentucky: $205,600
Median gross rent
$1,657
±$554 (90% margin)
Kentucky: $967
Where is Union and what county is it in?
Union is a city in Boone County, Kentucky. It covers 3.8 square miles of land, 1,928 residents per square mile in 2020.
Union 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 Union, and is it growing?
The Census Bureau estimates that 7,937 people lived in Union on July 1, 2025, up 6.9% since 2020, faster than Kentucky (+2.2%). The 2020 Census counted 7,416 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 7,642 (±21).
| Measure | Union | Boone County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 7,642 ±21 | 139,841 | +1,732 |
| Households | 2,626 ±223 | 50,963 | +697 |
| Average household size | 2.91 ±0.25 | 2.72 | no clear change |
| Housing units | 2,778 ±225 | 53,195 | +849 |
Union's population since 2000
From 2,893 in 2000 to 7,937 in 2025: up 174.4%. 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 39.5 years old; 26.0% are under 18 and 14.9% 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 5.8%. 3.9% of residents were born outside the United States.
| Measure | Union | Boone County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.5 ±4.0 | 37.7 | no clear change |
| Under 18 years | 26.0% ±4.4 pts | 25.6% | – |
| 65 years and over | 14.9% ±3.8 pts | 14.9% | – |
| Male | 53.0% ±3.4 pts | 49.8% | – |
| Hispanic or Latino (any race) | 3.0% ±2.8 pts | 5.9% | – |
| White alone, not Hispanic | 89.4% ±4.4 pts | 82.3% | no clear change |
| Black or African American alone, not Hispanic | 0.0% ±0.5 pts | 4.4% | – |
| Asian alone, not Hispanic | 1.8% ±2.5 pts | 2.4% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.5 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.5 pts | 0.3% | – |
| Two or more races, not Hispanic | 5.8% ±2.7 pts | 4.2% | – |
| Some other race alone, not Hispanic | 0.0% ±0.5 pts | 0.4% | – |
| Born outside the United States | 3.9% ±2.2 pts | 6.3% | −5.3 pts |
| Speak a language other than English at home (age 5+) | 4.9% ±3.2 pts | 8.8% | – |
| Civilian veterans (age 18+) | 5.9% ±2.6 pts | 7.8% | – |
| With a disability | 11.1% ±3.8 pts | 12.1% | – |
| No health insurance coverage | 1.4% ±1.2 pts | 5.1% | – |
| High school graduate or higher (age 25+) | 98.8% ±1.1 pts | 93.4% | – |
| Bachelor's degree or higher (age 25+) | 58.9% ±8.4 pts | 35.7% | no clear change |
| Graduate or professional degree (age 25+) | 24.2% ±6.0 pts | 13.3% | – |
| Lived in the same house a year earlier | 87.3% ±5.5 pts | 87.6% | – |
| Moved from another state in the past year | 2.4% ±1.9 pts | 2.7% | – |
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 2,626 households earn less than $136,712 a year (±$9,203), against $99,414 in Boone County and $63,726 in Kentucky. In 2015-2019 the median was $153,900 in 2024 dollars, so it fell by $17,188 after inflation.
| Measure | Union | Boone County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $136,712 ±$9,203 | $99,414 | −$17,188 |
| Mean household income | $160,212 ±$17,585 | $123,997 | – |
| Per capita income | $57,048 ±$5,133 | $46,264 | no clear change |
| People below the poverty line | 2.9% ±2.3 pts | 6.3% | – |
| Children under 18 below the poverty line | 0.0% ±1.9 pts | 6.8% | – |
| Households receiving SNAP | 0.0% ±1.4 pts | 6.5% | – |
| Households with a computer | 95.5% ±5.8 pts | 96.3% | – |
| Households with a broadband subscription | 94.6% ±5.8 pts | 93.8% | – |
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 82.5% of Union's occupied homes and renters 17.5%. The median owner-occupied home is valued at $411,500 by its owner (±$26,530). The median renter pays $1,657 a month including utilities.
| Measure | Union | Boone County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $411,500 ±$26,530 | $277,300 | +$87,581 |
| Median gross rent | $1,657 ±$554 | $1,373 | no clear change |
| Renters paying 35% or more of income on rent | 11.1% ±15.1 pts | 30.4% | – |
| Median monthly owner costs, with a mortgage | $2,297 ±$235 | $1,656 | – |
| Owner-occupied homes | 82.5% ±6.3 pts | 76.3% | −11.1 pts |
| Renter-occupied homes | 17.5% ±6.3 pts | 23.7% | – |
| Housing units | 2,778 ±225 | 53,195 | +849 |
| Homeowner vacancy rate | 0.0% ±1.7 pts | 0.4% | – |
| Rental vacancy rate | 14.2% ±16.4 pts | 4.3% | – |
| Single-family detached homes | 79.3% ±6.7 pts | 68.4% | – |
| Mobile homes | 0.7% ±1.2 pts | 3.6% | – |
| Built 2020 or later | 2.1% ±2.0 pts | 2.7% | – |
| Built 2010 to 2019 | 32.2% ±7.5 pts | 12.3% | – |
| Built 1939 or earlier | 0.0% ±1.3 pts | 1.8% | – |
| Households with no vehicle | 4.8% ±5.0 pts | 3.5% | – |
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 do people in Union work and get to work?
73.7% of Union's workers drive alone and 21.8% work from home. The average trip to work takes 26.4 minutes.
| Measure | Union | Boone County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 71.0% ±5.2 pts | 67.9% | – |
| Unemployment rate | 1.5% ±1.5 pts | 3.1% | – |
| Drove alone to work | 73.7% ±7.4 pts | 77.0% | – |
| Carpooled | 3.2% ±2.6 pts | 7.3% | – |
| Public transportation | 0.0% ±0.9 pts | 0.4% | – |
| Walked | 0.0% ±0.9 pts | 0.3% | – |
| Worked from home | 21.8% ±7.3 pts | 13.4% | +13.3 pts |
| Mean travel time to work | 26.4 min ±3.2 | 25.0 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?
1 census tract lies mostly in Union, and 4 more reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 703.16Boone County | 6,229 | $109,788 |
| Tract 703.09Boone County | 6,707 | $137,415 |
| Tract 703.18Boone County | 9,649 | $114,893 |
| Tract 706.05Boone County | 7,385 | $164,395 |
| Tract 706.01Boone County | 3,548 | $112,370 |
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 Kentucky?
By the Census Bureau's July 2025 estimates, Union is the 3,758th-most populous of the 19,476 U.S. incorporated places that have one and the 52nd-most populous of 418 in Kentucky.
Union ranks 9th of 230 places in Kentucky with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 52nd | 418 |
| Growth 2020-2025 (PEP) | 14th | 204 |
| Residents per square mile | 48th | 232 |
| Median household income | 9th | 230 |
| Per capita income | 16th | 232 |
| Median home value | 8th | 225 |
| Median gross rent | 9th | 217 |
| Bachelor's degree or higher | 13th | 223 |
| Median age | 99th | 232 |
| Owner-occupied share | 36th | 229 |
| Work from home | 11th | 130 |
| Travel time to work | 44th | 232 |
Union's figures with every place in Kentucky (CSV)
Every place in Kentucky, 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?
22 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.