JOHNSON COUNTY LAW ENFORCEMENT Clarksville City Police Department 203 Walnut Street Clarksville, Arkansas 72830 (479)754-8100 Chief of Police - Greg Donaldson The Clarksville Police Department covers 18 square miles with 14 full time officers, 1 part time officer, 3 full time radio operators, and two part time radio operators. Johnson County Sheriff's Department The Johnson County sheriff's office covers 22,781 residents of Clarksville, Coal Hill, Hartman, Knoxville and Lamar. Sheriff - Wes Kendrick 301 Porter Industrial Rd Clarksville, Arkansas 72830 Phone 479-754-2200