| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Mobil-Land Trailer Park | city | Illinois | United States | 40.46 | -89.02 | 830 | |
| Moccasin | city | Illinois | United States | 39.15 | -88.76 | 830 | |
| Mode | city | Illinois | United States | 39.27 | -88.73 | 830 | |
| Modena | city | Illinois | United States | 41.14 | -89.76 | 830 | |
| Modesto | city | Illinois | United States | 39.48 | -89.98 | 830 | |
| Modoc | city | Illinois | United States | 38.05 | -90.04 | 390 | |
| Moellenbrocks | city | Illinois | United States | 38.71 | -90.07 | 403 | |
| Mokena | city | Illinois | United States | 41.53 | -87.89 | 830 | |
| Moline | city | Illinois | United States | 41.51 | -90.52 | 830 | |
| Momence | city | Illinois | United States | 41.17 | -87.66 | 830 | |
| Monaville | city | Illinois | United States | 42.40 | -88.11 | 830 | |
| Monee | city | Illinois | United States | 41.42 | -87.74 | 830 | |
| Monica | city | Illinois | United States | 40.92 | -89.82 | 830 | |
| Monmouth | city | Illinois | United States | 40.91 | -90.65 | 830 | |
| Monroe Center | city | Illinois | United States | 42.10 | -89.00 | 839 | |
| Monroe City | city | Illinois | United States | 38.26 | -90.27 | 830 | |
| Mont Station | city | Illinois | United States | 38.77 | -89.93 | 830 | |
| Montclare | city | Illinois | United States | 41.93 | -87.80 | 830 | |
| Monterey | city | Illinois | United States | 40.53 | -89.95 | 830 | |
| Montezuma | city | Illinois | United States | 39.55 | -90.58 | 830 | |
| Montgomery | city | Illinois | United States | 41.73 | -88.35 | 830 | |
| Monticello | city | Illinois | United States | 40.03 | -88.57 | 830 | |
| Monto Karmel | city | Illinois | United States | 38.41 | -87.76 | 383 | |
| Montrose | city | Illinois | United States | 41.96 | -87.75 | 830 | |
| Montrose | city | Illinois | United States | 39.17 | -88.38 | 830 | |
| Moonshine | city | Illinois | United States | 39.19 | -87.90 | 830 | |
| Moorefield Estates | city | Illinois | United States | 41.65 | -87.94 | 830 | |
| Moores (historical) | city | Illinois | United States | 39.50 | -91.01 | 830 | |
| Moores Corner | city | Illinois | United States | 40.27 | -87.65 | 830 | |
| Mooseheart | city | Illinois | United States | 41.82 | -88.33 | 830 | |
| Moran Corners | city | Illinois | United States | 42.29 | -87.89 | 830 | |
| Morea | city | Illinois | United States | 38.93 | -87.63 | 830 | |
| Morehaven | city | Illinois | United States | 42.42 | -89.02 | 830 | |
| Moreland | city | Illinois | United States | 41.89 | -87.75 | 830 | |
| Morgan City (historical) | city | Illinois | United States | 39.76 | -90.43 | 830 | |
| Morgan Crossing | city | Illinois | United States | 41.66 | -88.34 | 830 | |
| Morgan Park | city | Illinois | United States | 41.69 | -87.67 | 830 | |
| Morganville | city | Illinois | United States | 38.28 | -88.90 | 830 | |
| Moriah | city | Illinois | United States | 39.22 | -87.94 | 830 | |
| Moro | city | Illinois | United States | 38.92 | -90.02 | 830 | |
| Moronts | city | Illinois | United States | 41.29 | -89.29 | 830 | |
| Morrelville | city | Illinois | United States | 39.85 | -90.80 | 830 | |
| Morris | city | Illinois | United States | 41.36 | -88.42 | 830 | |
| Morris Kennedy Subdivision | city | Illinois | United States | 42.23 | -89.07 | 830 | |
| Morrison | city | Illinois | United States | 41.81 | -89.97 | 830 | |
| Morrisonville | city | Illinois | United States | 39.42 | -89.46 | 830 | |
| Morristown | city | Illinois | United States | 41.40 | -90.30 | 830 | |
| Morristown | city | Illinois | United States | 42.17 | -89.07 | 830 | |
| Morse | city | Illinois | United States | 41.23 | -89.65 | 830 | |
| Morseville | city | Illinois | United States | 42.31 | -89.98 | 849 | |
| Mortimer | city | Illinois | United States | 39.86 | -87.72 | 830 | |
| Morton | city | Illinois | United States | 40.61 | -89.46 | 830 | |
| Morton Grove | city | Illinois | United States | 42.04 | -87.78 | 830 | |
| Moscow | city | Illinois | United States | 37.41 | -89.05 | 830 | |
| Moscow (historical) | city | Illinois | United States | 40.16 | -90.16 | 830 | |
| Mossville | city | Illinois | United States | 40.82 | -89.57 | 830 | |
| Motor Heights | city | Illinois | United States | 42.19 | -89.14 | 830 | |
| Mound City | city | Illinois | United States | 37.09 | -89.16 | 282 | |
| Mounds | city | Illinois | United States | 37.11 | -89.20 | 367 | |
| Mount Auburn | city | Illinois | United States | 39.77 | -89.26 | 830 | |
| Mount Carbon | city | Illinois | United States | 37.75 | -89.32 | 830 | |
| Mount Carmel | city | Illinois | United States | 38.41 | -87.76 | 383 | |
| Mount Carroll | city | Illinois | United States | 42.10 | -89.98 | 830 | |
| Mount Clare | city | Illinois | United States | 39.10 | -89.83 | 830 | |
| Mount Erie | city | Illinois | United States | 38.52 | -88.23 | 830 | |
| Mount Fulcher | city | Illinois | United States | 39.99 | -89.51 | 830 | |
| Mount Greenwood | city | Illinois | United States | 41.70 | -87.71 | 830 | |
| Mount Morris | city | Illinois | United States | 42.05 | -89.43 | 931 | |
| Mount Olive | city | Illinois | United States | 39.07 | -89.73 | 830 | |
| Mount Palatine | city | Illinois | United States | 41.19 | -89.16 | 830 | |
| Mount Pleasant | city | Illinois | United States | 37.45 | -89.07 | 830 | |
| Mount Pleasant | city | Illinois | United States | 41.83 | -87.67 | 830 | |
| Mount Prospect | city | Illinois | United States | 42.07 | -87.94 | 830 | |
| Mount Pulaski | city | Illinois | United States | 40.01 | -89.28 | 830 | |
| Mount Sterling | city | Illinois | United States | 39.99 | -90.76 | 830 | |
| Mount Vernon | city | Illinois | United States | 38.32 | -88.90 | 830 | |
| Mount Zion | city | Illinois | United States | 39.77 | -88.87 | 830 | |
| Mountain Glen | city | Illinois | United States | 37.53 | -89.29 | 830 | |
| Mountjoy | city | Illinois | United States | 40.29 | -89.28 | 830 | |
| Moweaqua | city | Illinois | United States | 39.62 | -89.02 | 830 | |
| Mozier | city | Illinois | United States | 39.29 | -90.75 | 830 | |
| Mozier Landing | city | Illinois | United States | 39.26 | -90.73 | 830 |