Place
- Marion2
- Mauvaise Terre Creek at US Rt 67, NE of bridge, Concord 7.5' quad.2
- Merimac Springs2
- Mokena.2
- Morton Arboretum, Lisle2
- Murphysboro, CH 5 (20th Street) bridge over the Big Muddy River; Murphysboro quad.2
- NW of Mossville2
- Naperville.2
- Near Arlington Race Track2
- Near Chicago.2
- Near Union stock yards, Chicago2
- Near Wady Petra2
- Northwest, Old2
- Ohio2
- Peoria Heights2
- Peoria.2
- Port Byron2
- Randolph2
- Sangamon2
- Shawnee National Forest, about 7 miles ESE of Harrisburg.2