Law Enforcement Agencies in Thatcher, SD SD › Dewey County Agencies serving the city of Thatcher in SD. Agency Types in Thatcher Municipal Police 1 agencies Tribal Police 3 agencies All Agencies in Thatcher, SD Cheyenne River Detective Division Dewey County Cheyenne River F/G/P Dewey County Cheyenne River Tribal PD Dewey County Eagle Butte Police Department Dewey County
