There are 14 cities in Union County, Illinois.
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 | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Carbondale | 1 | Illinois | 21,492 | 21,890 | -0.46% | 1,230 | 17.48 |
| Anna | 2 | Illinois | 4,087 | 4,282 | -1.19% | 1,107 | 3.69 |
| Jonesboro | 3 | Illinois | 1,623 | 1,702 | -1.22% | 601 | 2.70 |
| Goreville | 4 | Illinois | 1,059 | 1,063 | -0.09% | 394 | 2.69 |
| Cobden | 5 | Illinois | 1,023 | 1,069 | -1.16% | 839 | 1.22 |
| Dongola | 6 | Illinois | 632 | 660 | -1.09% | 581 | 1.09 |
| Makanda | 7 | Illinois | 527 | 537 | -0.57% | 100 | 5.28 |
| Ullin | 8 | Illinois | 443 | 466 | -1.34% | 158 | 2.81 |
| Alto Pass | 9 | Illinois | 301 | 313 | -0.99% | 141 | 2.13 |
| East Cape Girardeau | 10 | Illinois | 250 | 285 | -3.48% | 127 | 1.96 |
| McClure | 11 | Illinois | 221 | 253 | -3.49% | 145 | 1.53 |
| Cypress | 12 | Illinois | 218 | 218 | 0% | 290 | 0.75 |
| Buncombe | 13 | Illinois | 206 | 206 | 0% | 174 | 1.19 |
| Mill Creek | 14 | Illinois | 54 | 57 | -1.82% | 144 | 0.38 |
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.
Carbondale is the largest city in Union County.
Mill Creek is the smallest city in Union County.
There are 14 cities in Union County, Illinois.