| Business | Phone |
| County Buildings & Grounds 130 Jefferson St, Tiffin 44883 | (419) 448-5065 |
| County Dog Warden 3140 S State Route 100, Tiffin 44883 | (419) 448-5097 |
| Help Me Grow Early Interventio 797 E Township Road 201, Tiffin 44883 | (419) 447-7674 |
| Maintenance Garage 3210 S State Route 100, Tiffin 44883 | (419) 447-3863 |
| Seneca Commissioners Office 81 Jefferson St # 3202, Tiffin 44883 | (419) 447-4550 |
| Seneca County Auditor's Office 109 S Washington St # 2206, Tiffin 44883 | (419) 447-0692 |
| Seneca County Board-Elections 71 S Washington St # 1101, Tiffin 44883 | (419) 447-4424 |
| Seneca County Cooperative Ext 3140 S State Route 100, Tiffin 44883 | (419) 447-9722 |
| Seneca County Dept-Pblc Safety 126 Hopewell Ave, Tiffin 44883 | (419) 447-0266 |
| Seneca County Mental Rtrdtn 3140 S State Route 100, Tiffin 44883 | (419) 447-7674 |
| Seneca County Microfilming 109 S Washington St # 2001, Tiffin 44883 | (419) 448-5050 |
| Seneca County Opportunity Center 780 County Road 20, Tiffin 44883 | (419) 447-7521 |
| Seneca County Prosecutors Office 71 S Washington St # 1204, Tiffin 44883 | (419) 448-4444 |
| Seneca County Recorder 109 S Washington St # 2104, Tiffin 44883 | (419) 447-4434 |
| Seneca County Title Dept 117 E Market St # 4102, Tiffin 44883 | (419) 447-3433 |
| Seneca County Veterans Svc 920 County Road 20, Tiffin 44883 | (419) 447-2885 |
| Seneca County Youth Center 3484 S Township Road 151, Tiffin 44883 | (419) 447-7852 |
| Seneca Wyandot Ed Resource Center 3100 S State Route 100, Tiffin 44883 | (419) 443-1600 |