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Welcome to Seneca County ...

Time Zone: Seneca County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time.

The community of Tiffin is the Seat for Seneca County.

Seneca County was founded April 1, 1820 and was created by taking area from Huron County.

From the Census Estimates for 2019, <1> Seneca had a population of 55,178 people. This is a decrease of 2.54% since the last Census (which gave a population of 56,618 people in 2010).

At the time of the 2010 Census, Seneca represented 0.49% of the total population of Ohio.

Below are some of the communities located in Seneca County:

  • Attica
    (15 miles [24.1 km] to the east)
    • Attica is located in Seneca County (OH)
    • Jump to our Gazetteer entry for Attica
    • Population from the 2020 Census: 862 people
    • Jump to TripAdvisor's Tourism page for Attica <2>
  • Bettsville
    (8 miles [12.9 km] to the north)
  • Bloomville
    (9 miles [14.5 km] to the southeast)
  • Fostoria
    (12 miles [19.3 km] to the west)
    • Fostoria is located in Seneca County (OH)
    • Jump to our Gazetteer entry for Fostoria
    • Population from the 2020 Census: 13,194 people
    • Jump to TripAdvisor's Tourism page for Fostoria <2>
  • Green Springs
    (10 miles [16.1 km] to the northeast)
  • New Riegel
    (9 miles [14.5 km] to the southwest)
  • Republic
    (8 miles [12.9 km] to the east)
  • Tiffin
    (Less than 2 miles to the south)
    • Tiffin is located in Seneca County (OH)
    • Jump to our Gazetteer entry for Tiffin
    • Population from the 2020 Census: 17,359 people
    • Jump to TripAdvisor's Tourism page for Tiffin <2>

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.