Seneca County Map, Ohio

Written and Fact-checked by | Updated On: April 30, 2026 | 13:31 ET

Map of Seneca County - Seneca County is a county located in the U.S. state of Ohio. Seneca County Map showing cities, highways, important places and water bodies. Get Where is Seneca County located in the map, major cities in Seneca county, population, areas, and places of interest.

Map of Seneca County, Ohio

Map of Seneca County, Ohio

About Seneca County Map, Ohio: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.

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About Seneca County, Ohio

Seneca County is a county located in the U.S. state of Ohio. It's county seat is Tiffin. As per 2020 census, the population of Seneca County is 54906 people and population density is square miles. According to the United States Census Bureau, the county has a total area of 550.59 sq mi (1,426 km2). Seneca County was established on -29127.

Seneca County Facts

ContinentNorth America
CountryUnited States
StateOhio
County SeatTiffin
Largest City/TownTiffin
EstablishedFebruary 12, 1820
Total Area553 sq mi (1,432 sq km)
Land Area551 sq mi (1,427 sq km)
Water Area2.1 sq mi (5.4 sq km)
Population55,069 (Census 2020)
Population Density100 people per sq mi
Time ZoneEastern Time Zone (ET)
Major HighwaysUS-224, US-23, State Route 18, State Route 53, State Route 4
Neighboring CountiesSandusky County, Huron County, Crawford County, Wyandot County, Hancock County, Wood County
Famous ForTiffin University, Heidelberg University, agriculture
Top AttractionsHedges-Boyer Park, Seneca Caverns, Tiffin Glass Museum, Sandusky River
Official Websitehttps://senecacountyohio.gov/

Cities and Towns in Seneca County, Ohio

  • Tiffin (county seat) – 17,963 (Census 2020)
  • Fostoria (partly) – 13,046 (Census 2020)
  • Attica – 899 (Census 2020)
  • Bloomville – 967 (Census 2020)

Roads and Highways in Seneca County, Ohio

Seneca County is connected by highways that link it to north-central and northwest Ohio.

  • US-224 – major east-west route connecting Tiffin to Findlay and Bucyrus
  • US-23 – runs north-south linking the county to Toledo and Columbus
  • State Route 18 – connects Tiffin to Norwalk and Fostoria
  • State Route 53 – runs north-south connecting Tiffin to Fremont and Upper Sandusky
  • State Route 4 – links the county to Bucyrus and Sandusky

Neighboring Counties of Seneca County

  • Sandusky County (north)
  • Huron County (northeast)
  • Crawford County (east)
  • Wyandot County (south)
  • Hancock County (west)
  • Wood County (northwest)

Top Attractions in Seneca County, Ohio

Seneca County offers a mix of educational, historical, and outdoor attractions.

  • Seneca Caverns – underground caves with guided tours
  • Hedges-Boyer Park – popular park with trails and sports facilities
  • Tiffin Glass Museum – showcases historic glassmaking
  • Heidelberg University campus – scenic grounds and cultural events
  • Tiffin University – educational institution with local events
  • Sandusky River – scenic waterway for outdoor recreation
  • Fort Ball Historic Site nearby – historic military site
  • Downtown Tiffin – charming area with shops and restaurants

Distance from Seneca County to Nearby Cities

  • Seneca County to Toledo – 50 mi (80 km)
  • Seneca County to Columbus – 100 mi (161 km)
  • Seneca County to Cleveland – 90 mi (145 km)
  • Seneca County to Findlay – 25 mi (40 km)
  • Seneca County to Mansfield – 50 mi (80 km)

FAQs about Seneca County

Where is Seneca County located?

Seneca County is located in north-central Ohio.

What is Seneca County known for?

It is known for its universities, agriculture, and historic attractions.

What is the population of Seneca County?

The population was 55,069 according to the 2020 Census.

What is the county seat of Seneca County?

The county seat is Tiffin.

Are there attractions in Seneca County?

Yes, the county offers parks, museums, and natural attractions.