Law Enforcement Agencies in Leonardtown, MD MD › St. Mary's County Agencies serving the city of Leonardtown in MD. Agency Types in Leonardtown County Jails 1 agencies Sheriff 1 agencies State Police 1 agencies All Agencies in Leonardtown, MD Maryland State Police St. Mary's County St Mary's County Detention Center St. Mary's County St Mary's County Sheriffs Office St. Mary's County
