Illinois State Route 104 runs east-west across Southern Sangamon County. This is the main surface road spaning the width of the southern portion of the county. IL St Rt 104 pass through the following towns in Sangamon County. Auburn
IL St Rt 104 is not multi-plexed in Sangamon County. IL St Rt 104 intersects the following hihgways in Sangamon County. Illinois State Route 4, at Auburn.