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Where am ILOCATED

Union County, Ohio

Union County, Ohio, has 73,446 residents (July 2025 estimate). Its county seat is Marysville. It uses Eastern Time and covers 432 sq mi (1,118 km²) of land.

ColumbusClevelandCincinnati
Union County in Ohio
Champaign CountyDelaware CountyLogan CountyDublinMarysvilleRichwoodNew California
Union County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
73,446
Land area
432 sq mi (1,118 km²)
County seat or government
Marysville
Time zone
Eastern TimeUTC-05:00 in January; UTC-04:00 in July
Median household income
$112,322 ± $3,644
Median home value
$344,900 ± $11,197
Median rent, with utilities
$1,247 ± $62
Homes lived in by their owners
79.2% ± 1.6 points
County type
County
Metro or micro area
Columbus, OH metro areaOutlying county
Water area
5.18 sq mi (13.4 km²)
State
Ohio
County code (FIPS)
39159
Coordinates (central point)
40.295901, -83.367042
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Union County

Time zoneLocal time and UTC offsetNext clock change
Eastern TimeAmerica/New_YorkUTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 4301561,401 people
  2. 4330253,702 people
  3. 4301646,362 people
  4. 4301741,613 people
  5. 4304038,990 people
  6. 4306418,143 people
  7. 433446,173 people
  8. 430614,921 people
  9. 433423,836 people
  10. 430602,359 people
  11. 433582,275 people
  12. 433402,103 people
All 21
  1. 430671,884 people
  2. 430451,739 people
  3. 43084991 people
  4. 43319851 people
  5. 43345666 people
  6. 43029544 people
  7. 43036359 people
  8. 43077269 people
  9. 4300763 people

21 ZIP Code areas overlap Union County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

Union County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Union County, largest first

  1. Paris Township29,129 people
  2. Jerome Township10,270 people
  3. Washington Township4,348 people
  4. Claibourne Township3,760 people
  5. Allen Township2,597 people
  6. Darby Township2,586 people
  7. Dover Township2,546 people
  8. Liberty Township2,232 people
  9. Leesburg Township2,096 people
  10. Millcreek Township1,704 people
  11. Union Township1,538 people
  12. Taylor Township1,503 people
All 15
  1. York Township1,254 people
  2. Jackson Township959 people
  3. Washington Township802 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Ohio, by county

School districts in Union County, largest first

  1. Dublin City School District94,939 people
  2. Marysville Exempted Village School District37,016 people
  3. Buckeye Valley Local School District19,252 people
  4. Jonathan Alder Local School District11,831 people
  5. Benjamin Logan Local School District10,779 people
  6. North Union Local School District8,881 people
  7. Fairbanks Local School District7,244 people
  8. Elgin Local School District7,033 people
  9. Triad Local School District5,597 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Dublin, Ohio (city)49,294 people
  2. Marysville, Ohio (city)27,518 people
  3. Plain City, Ohio (village)3,829 people
  4. Richwood, Ohio (village)2,332 people
  5. New California, Ohio (CDP)1,672 people
  6. Milford Center, Ohio (village)770 people
  7. Raymond, Ohio (CDP)415 people
  8. Magnetic Springs, Ohio (village)359 people
  9. Unionville Center, Ohio (village)269 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Delaware County, Ohio19 mi east
  2. Logan County, Ohio22 mi west
  3. Marion County, Ohio23 mi northeast
  4. Champaign County, Ohio24 mi southwest
  5. Madison County, Ohio28 mi south
  6. Franklin County, Ohio29 mi southeast
  7. Hardin County, Ohio30 mi northwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.