The Sheriff and Deputies are the police force for residents of the unincorporated areas of the county and provide contracted law enforcement for the cities of Delaware County, Iowa.

 Colesburg

 Delhi

 Dundee

 Earlville

 Edgewood

 Greeley

 Hopkinton

 Masonville

 Ryan

The Sheriff's Office handles all routine and emergency calls for these areas, and regularly patrols all areas of the county.

They also provide security at special events in the county.