Download PDF O'Fallon (IL) USGS topo maps. These are full-sheet 7.5 Minute (1:24,000 scale) topographic maps. The red outline on the map below identifies the boundaries of the O'Fallon topo map.
O'Fallon topo maps are provided as PDF files.
Note: The most current map is the 2021 O'Fallon topographic map.