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Where am ILOCATED

Mercer County, Ohio

Mercer County, Ohio, has 42,737 residents (July 2025 estimate). Its county seat is Celina. It uses Eastern Time and covers 462 sq mi (1,198 km²) of land.

ColumbusClevelandCincinnati
Mercer County in Ohio
Jay CountyAuglaize CountyCelinaColdwaterSt. HenryFort RecoveryMaria Stein
Mercer County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
42,737
Land area
462 sq mi (1,198 km²)
County seat or government
Celina
Time zone
Eastern TimeUTC-05:00 in January; UTC-04:00 in July
Median household income
$76,782 ± $4,484
Median home value
$210,600 ± $9,217
Median rent, with utilities
$804 ± $57
Homes lived in by their owners
79.6% ± 2.2 points
County type
County
Metro or micro area
Celina, OH micro areaCentral county
Water area
11 sq mi (28.4 km²)
State
Ohio
County code (FIPS)
39107
Coordinates (central point)
40.535331, -84.632056
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 Mercer 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. 4582219,957 people
  2. 4588512,753 people
  3. 458286,404 people
  4. 458655,522 people
  5. 458464,644 people
  6. 458874,422 people
  7. 458694,170 people
  8. 458834,144 people
  9. 458453,429 people
  10. 458822,919 people
  11. 458602,326 people
  12. 458621,417 people
All 18
  1. 45898917 people
  2. 45388841 people
  3. 45894602 people
  4. 45826394 people
  5. 45310227 people
  6. 45866117 people

18 ZIP Code areas overlap Mercer 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

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Mercer County, largest first

  1. Jefferson Township13,786 people
  2. Butler Township6,634 people
  3. Granville Township4,235 people
  4. Marion Township3,346 people
  5. Franklin Township2,539 people
  6. Gibson Township2,303 people
  7. Recovery Township1,857 people
  8. Dublin Township1,827 people
  9. Union Township1,325 people
  10. Liberty Township1,070 people
  11. Center Township1,012 people
  12. Black Creek Township885 people
All 15
  1. Washington Township851 people
  2. Hopewell Township756 people
  3. Wayne Township58 people

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

School districts in Mercer County, largest first

  1. Celina City School District18,733 people
  2. Coldwater Exempted Village School District6,675 people
  3. Parkway Local School District5,885 people
  4. St. Henry Consolidated Local School District4,642 people
  5. Fort Recovery Local School District4,627 people
  6. Minster Local School District4,614 people
  7. Marion Local School District4,211 people
  8. New Bremen Local School District3,955 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. Celina, Ohio (city)10,903 people
  2. Coldwater, Ohio (village)4,191 people
  3. St. Henry, Ohio (village)2,741 people
  4. Fort Recovery, Ohio (village)1,729 people
  5. Maria Stein, Ohio (CDP)1,305 people
  6. Rockford, Ohio (village)1,008 people
  7. Mendon, Ohio (village)713 people
  8. Chickasaw, Ohio (village)394 people
  9. Burkettsville, Ohio (village)227 people
  10. Montezuma, Ohio (village)117 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Jay County, Indiana21 mi west
  2. Auglaize County, Ohio21 mi east
  3. Adams County, Indiana22 mi northwest
  4. Van Wert County, Ohio22 mi north
  5. Shelby County, Ohio26 mi southeast
  6. Darke County, Ohio28 mi south

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.