De Kalb County Board 200 N Main St Sycamore, IL 60178 Phone : (815) 895-7189 Business Category Government Offices-County Legislative Bodies Dekalb County Government--county Board, Chairman 200 N Main Dekalb, IL 60115 Phone : (815) 895-7189 Business Category Government Offices & Public Schools Dekalb County Government--county Board, Office 110 E Sycamore St Sycamore, IL 60178 Phone : (815) 895-7189 Business Category Government Offices-County Government Offices & Public Schools