| Business | Phone |
| Ashippun Town Hall W1266 County Road O, Oconomowoc 53066 | (920) 474-4781 |
| Summit Town Hall 2911 N Dousman Rd, Oconomowoc 53066 | (262) 567-2757 |
| Oconomowoc City Clerk 174 E Wisconsin Ave, Oconomowoc 53066 | (262) 569-2186 |
| Oconomowoc City Mayor's Office 174 E Wisconsin Ave, Oconomowoc 53066 | (262) 569-1111 |
| Oconomowoc Town Hall W359n6812 Brown St, Oconomowoc 53066 | (262) 567-0251 |