| Business | Phone |
| Carroll Township Svc Complex 11080 W Toussaint East Rd, Oak Harbor 43449 | (419) 898-9621 |
| Oak Harbor Administrator's Office 146 N Church St, Oak Harbor 43449 | (419) 898-5561 |
| Oak Harbor Light & Water 146 N Church St, Oak Harbor 43449 | (419) 898-3231 |
| Oak Harbor Light & Water Plant 228 W Park St, Oak Harbor 43449 | (419) 898-3881 |
| Oak Harbor Mid County Ems 222 W Washington St, Oak Harbor 43449 | (419) 898-9366 |
| Oak Harbor Sewage Dept 355 E Water St, Oak Harbor 43449 | (419) 898-0517 |
| Salem Township Garage 11650 W Portage River South Rd, Oak Harbor 43449 | (419) 898-4126 |