| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| McCall | city | Illinois | United States | 40.45 | -91.20 | 830 | |
| McClay Orchard | city | Illinois | United States | 39.47 | -90.53 | 830 | |
| McClure | city | Illinois | United States | 37.32 | -89.43 | 337 | |
| McClusky | city | Illinois | United States | 39.04 | -90.32 | 830 | |
| McConnell | city | Illinois | United States | 42.43 | -89.73 | 830 | |
| McCook | city | Illinois | United States | 41.80 | -87.84 | 830 | |
| McCormick | city | Illinois | United States | 37.55 | -88.67 | 830 | |
| McCormickville | city | Illinois | United States | 41.89 | -87.63 | 830 | |
| McCown | city | Illinois | United States | 39.80 | -87.93 | 830 | |
| McCulley Subdivision | city | Illinois | United States | 40.88 | -88.60 | 830 | |
| McCullom Lake | city | Illinois | United States | 42.37 | -88.29 | 830 | |
| McDowell | city | Illinois | United States | 40.83 | -88.59 | 830 | |
| McGirr | city | Illinois | United States | 41.82 | -88.80 | 889 | |
| McHenry | city | Illinois | United States | 42.33 | -88.27 | 830 | |
| McHenry Shores | city | Illinois | United States | 42.32 | -88.26 | 830 | |
| McIntosh Settlement (historical) | city | Illinois | United States | 38.22 | -88.36 | 380 | |
| McKeen | city | Illinois | United States | 39.46 | -87.61 | 830 | |
| McKenna Woods | city | Illinois | United States | 41.57 | -88.21 | 830 | |
| McKinley | city | Illinois | United States | 38.23 | -89.55 | 830 | |
| McKinley Park | city | Illinois | United States | 41.83 | -87.67 | 830 | |
| McLean | city | Illinois | United States | 40.31 | -89.17 | 830 | |
| McLeansboro | city | Illinois | United States | 38.09 | -88.54 | 830 | |
| McNabb | city | Illinois | United States | 41.18 | -89.21 | 830 | |
| McNulta | city | Illinois | United States | 40.37 | -88.49 | 830 | |
| McQueen | city | Illinois | United States | 42.06 | -88.38 | 908 | |
| McVey | city | Illinois | United States | 39.39 | -89.75 | 830 |