Seneca County, Ohio Business Directory & Community Resources

  

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View the 2025 U.S. Census demographic profile for Seneca County

Seneca County — County Seat: Tiffin

2026 Population Estimate: 54,350  |  Official Website: https://senecacountyohio.gov/

Seneca County is a north-central Ohio county with the charming city of Tiffin as its county seat. Tiffin is home to two private four-year universities — Heidelberg University (founded 1850 by German Reformed immigrants, known for strong science and environmental programs) and Tiffin University (emphasizing business and justice programs) — giving the county a remarkably high concentration of higher education for its size. The county also has a significant manufacturing and agricultural economy. Major employers include Whirlpool Corporation (Clyde, just in Sandusky County but employing many Seneca County residents), Tiffin Motorhomes, National Machinery, and Mercy Health - Tiffin Hospital. The scenic Sandusky River corridor provide recreation.

▸ Key Industries & Major Employers
Manufacturing, healthcare, and agriculture.
Major employers include Mercy Health–Tiffin Hospital, Tiffin University, Heidelberg University, and several manufacturers including National Machinery (cold-forming equipment, globally significant) and Fremont Die Casting.

▸ Notable Economic Development Initiatives
National Machinery's continued global leadership in fastener and cold-forming equipment anchors Seneca County's precision manufacturing identity. Tiffin University's growth supports workforce development. The Seneca County Economic Development Office works with RGP Ohio on business retention. Rural broadband expansion is targeted for underserved townships.

▸ Infrastructure & Investment Highlights
US-224 and SR-18 provide primary access. The Sandusky River runs through Tiffin. Norfolk Southern rail serves manufacturers. The county is pursuing shovel-ready industrial site development to attract new manufacturers.