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Union County, OH
7 cities and towns and 7 ZIP codes in Union County, Ohio.
Population
67,324
Land area
432sq mi
People per sq mi
156
ZIP codes
7
Cities and towns in Union County
Union County at a glance
- Union County is 46% less dense than Ohio as a whole.
- Households here earn a median of $112,322 a year, 57% more than the Ohio figure of $71,389.
- A typical owner-occupied home is valued at $344,900 (61% above Ohio) and median rent is $1,247 a month.
- The biggest population centers are Marysville (27,518), Richwood (2,332) and New California (1,672).
Local data for Union County, OH
Counts from official public data
Housing and community stats
Union County, OH, American Community Survey 2020-2024
Median household income
$112,322
Poverty rate
5.0%
Median home value
$344,900
Prices +3.5% in a year
Median rent
$1,247/mo
Homeownership
79.2%
Bachelor's or higher
39.2%
Median age
38.5
Average commute
26.0 min
Largest reported origins and ancestries: German Americans (17,662), Irish Americans (8,817), Italian Americans (3,692).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
2.9%
Aug 2026, -0.7 pts in a year
Average annual pay
$75,342
36,813 jobs, 2025
Income per person
$75,616
BEA, 2024
Federal spending
$309M
FY 2026, $4,918 per person
PPP loans
$51.9M
949 loans, 8,309 jobs reported
Campaign donations
$156K
Itemized, 2026 cycle
How people get to work
Union County, OH, workers 16 and older. American Community Survey 5-year estimates
- Drove alone70.0%
- Carpooled5.9%
- Public transit0.7%
- Walked0.5%
- Bicycle0.1%
- Taxi, ride-hailing, motorcycle or other1.2%
- Worked from home21.6%
Average one-way commute: 26.0 minutes for people who do not work from home.
Environment and hazard risk
Union County, OH, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: ice storm
Storm events since 1996
379
Most often thunderstorm wind
Flood insurance policies
58
0.3% of homes, county
July high / Jan low
85° / 21°F
40.5 inches of rain a year
Hazards, floods and storm historyCheck a flood zone4 historic places
Health statistics
Share of adults in Union County, OH, CDC PLACES estimates
Obesity
39.8%
U.S. 33.3% +6.5 pts
Diabetes
10.2%
U.S. 12.1% -1.9 pts
Smoking
12.6%
U.S. 12.8% about the same
Uninsured (18-64)
6.3%
U.S. 11.1% -4.8 pts
Cities, towns and ZIP codes in Union County
Population shown
Frequently asked questions
- What is the largest city in Union County, OH?
- Marysville is the largest city or town in Union County, with about 27,518 residents.
- How many ZIP codes are in Union County?
- Union County includes 7 ZIP Code Tabulation Areas, including 43007, 43036, 43040, 43045, 43067.
- What is the population of Union County, OH?
- About 67,324 people live in Union County, based on American Community Survey 5-year estimates.
- What counties border Union County?
- Union County borders Franklin County, Delaware County, Marion County, Logan County, Madison County, Champaign County, Hardin County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023