The Hennepin County Sheriff's Office serves the countyâ??s 1.2 million residents. State law mandates most of the sheriffâ??s office duties, including managing the county jail and providing security to the district court.\n\nThe sheriffâ??s office also creates initiatives including undercover narcotics investigations and homeland security activities in line with the officeâ??s mandate to â??keep and preserve the peace of the county.â??