Here is a list of the largest private employers, sorted by number of employees (in ranges). Obtained from publicly available information sources (2014) and other more current research. It is being continually updated. 500+
- Mercy Tiffin Hospital (health)
- Ameriwood Industries (manufacturing)
200-499 employees
- Church & Dwight (manufacturing)
- Heidelberg University (education)
- Mennel Milling (manufacturing)
- National Machinery (manufacturing)
- ProMedica Fostoria Community Hospital (healthcare)
- Seneca Medical (distribution)
- St. Francis Community (healthcare)
- Tiffin University (education)
- Toledo Molding & Die (manufacturing)
- WalMart Supercenter (retail)
- Webster Industries (manufacturing)
100-200
- ACI Construction (construction)
- American Fine Sinter (manufacturing)
- Arnold Vending (manufacturing/distribution)
- Autumnwood Care Center (healthcare)
- Carmeuse Lime & Stone (mining)
- Good Shepherd Home (healthcare)
- Flat Rock Care Center (healthcare)
- Fry Foods (manufacturing)
- Institutional Care Pharmacy (distribution)
- Kroger (retail)
- Laminate Technologies (manufacturing)
- Lowe's Home Improvement (retail)
- North Central Ohio Educational Service Center (education)
- Northwest Ohio Orthopedics (healthcare)
- Owens Corning (manufacturing)
- Seneca County Opportunity Center (healthcare)
- Taiho Corporation of America (manufacturing)
- Tiffin Community YMCA (recreation)
- Tiffin Metal Products (manufacturing)
50-99 employees
- Quick Tab II (manufacturing)
- Advertiser-Tribune (information)
- ARAMARK (service)
- Ballreich Bros. (manufacturing, retail)
- Carmie's Grill & Bar (retail)
- Callie's Performance Products (manufacturing)
- ECS Billing & Consulting (service)
- Firelands Counseling & Recovery (healthcare)
- Frisch's Big Boy Restaurant (retail)
- JB Roofing Company (construction)
- Kenneth G. Myers Construction (construction)
- McDonald's (retail)
- Miller Cable (construction)
- Quick Tab II (printing)
- Ruffing Family Care Center (healthcare)
- Seneca Tiles (manufacturing)
- Seneca Millwork (manufacturing)
- Sparkle n Shine (service)
- TPC Food Service (distribution)
- Work Connections International (manufacturing/service)
