Courthouses in Onalaska, Wisconsin, the US. Courthouses locations in Onalaska, Wisconsin. Find the nearest courthouses locations, near you. All types of business services Accounting ATM Bank Courthouse Finance Funeral home Insurance Lawyer Real estate School Travel All courthouses in Onalaska Onalaska Municipal Court Clerk Courthouse +1 608-781-9558 415 Main Street, Onalaska, Wisconsin 54650 Write a review Phone Website Directions