Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Litchfield | 1 | 6,565 | 6,761 | -0.74% | 733 | 9.0 | City |
| Hillsboro | 2 | 5,744 | 5,860 | -0.5% | 666 | 8.6 | City |
| Nokomis | 3 | 2,075 | 2,138 | -0.77% | 1,643 | 1.3 | City |
| Raymond | 4 | 914 | 942 | -0.76% | 727 | 1.3 | Village |
| Witt | 5 | 758 | 782 | -0.78% | 612 | 1.2 | City |
| Taylor Springs | 6 | 725 | 736 | -0.41% | 687 | 1.1 | Village |
| Farmersville | 7 | 664 | 684 | -0.75% | 939 | 0.7 | Village |
| Coffeen | 8 | 626 | 642 | -0.64% | 539 | 1.2 | City |
| Schram City | 9 | 547 | 563 | -0.73% | 966 | 0.6 | Village |
| Irving | 10 | 362 | 373 | -0.82% | 404 | 0.9 | Village |
| Panama | 11 | 325 | 332 | -0.61% | 890 | 0.4 | Village |
| Fillmore | 12 | 296 | 302 | -0.67% | 446 | 0.7 | Village |
| Waggoner | 13 | 178 | 180 | -0.56% | 730 | 0.2 | Village |
| Harvel | 14 | 168 | 174 | -1.18% | 233 | 0.7 | Village |
| Butler | 15 | 163 | 165 | -0.61% | 273 | 0.6 | Village |
| Donnellson | 16 | 148 | 152 | -0.67% | 399 | 0.4 | Village |
| Ohlman | 17 | 107 | 111 | -0.93% | 333 | 0.3 | Village |
| Walshville | 18 | 60 | 62 | -1.64% | 236 | 0.3 | Village |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Litchfield is the largest city in Montgomery County.
Walshville is the smallest city in Montgomery County.
There are 18 cities in Montgomery County, Illinois.