Law Enforcement Agencies in Oak Grove, WI WI › Dodge County Agencies serving the city of Oak Grove in WI. Agency Types in Oak Grove Coroners 1 agencies County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in Oak Grove, WI Dodge County Detention Facility Dodge County Dodge County Medical Examiner Office Dodge County Dodge County Sheriffs Office Dodge County Juneau Police Department Dodge County