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 |
|---|---|---|---|---|---|---|---|
| Decatur | 1 | 67,917 | 70,927 | -1.1% | 1,562 | 43.5 | City |
| Mount Zion | 2 | 5,832 | 6,014 | -0.78% | 1,367 | 4.3 | Village |
| Forsyth | 3 | 3,609 | 3,728 | -0.82% | 1,166 | 3.1 | Village |
| Maroa | 4 | 1,514 | 1,576 | -1.05% | 858 | 1.8 | City |
| Harristown | 5 | 1,251 | 1,309 | -1.19% | 696 | 1.8 | Village |
| Long Creek | 6 | 1,207 | 1,253 | -0.98% | 428 | 2.8 | Village |
| Macon | 7 | 1,116 | 1,171 | -1.24% | 881 | 1.3 | City |
| Blue Mound | 8 | 1,075 | 1,129 | -1.29% | 1,838 | 0.6 | Village |
| Warrensburg | 9 | 1,075 | 1,111 | -0.83% | 1,477 | 0.7 | Village |
| Argenta | 10 | 868 | 910 | -1.25% | 1,329 | 0.7 | Village |
| Oreana | 11 | 847 | 887 | -1.17% | 1,810 | 0.5 | Village |
| Niantic | 12 | 582 | 609 | -1.19% | 560 | 1.0 | Village |
| Boody | 13 | 434 | 442 | 2.84% | 377 | 1.2 | CDP |
| Elwin | 14 | 75 | 143 | 8.7% | 90 | 0.8 | CDP |
| Lake City | 15 | 46 | 107 | 9.52% | 119 | 0.4 | CDP |
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.
Decatur is the largest city in Macon County.
Lake City is the smallest city in Macon County.
There are 15 cities in Macon County, Illinois.