Route 103 begins at a junction with U.S. Route 24 in Woodstock Township in southern Schuyler County, northeast of Ripley.
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After passing through Sugar Grove, the highway enters Bainbridge Township.
Illinois | University of Illinois at Urbana-Champaign | Peoria, Illinois | Rockford, Illinois | Evanston, Illinois | Springfield, Illinois | Northern Illinois University | Cook County, Illinois | U.S. Route 66 | U.S. Route 1 | Illinois Institute of Technology | Pan Am Flight 103 | Joliet, Illinois | U.S. Route 6 | U.S. Route 101 | Route 66 | Rock Island, Illinois | Belleville, Illinois | Aurora, Illinois | U.S. Route 30 | Southern Illinois University | Quincy, Illinois | New Jersey Route 4 | Illinois River | European route E65 | U.S. Route 40 | Governor of Illinois | California State Route 1 | Wheaton, Illinois | Waukegan, Illinois |