There are 29 cities in Williamson 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 | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Carbondale | 1 | 21,492 | 21,890 | -0.46% | 1,230 | 17.5 | City |
| Marion | 2 | 16,856 | 16,840 | 0.02% | 1,170 | 14.4 | City |
| Herrin | 3 | 12,124 | 12,339 | -0.44% | 1,253 | 9.7 | City |
| West Frankfort | 4 | 7,109 | 7,253 | -0.5% | 1,426 | 5.0 | City |
| Carterville | 5 | 5,793 | 5,852 | -0.26% | 1,093 | 5.3 | City |
| Johnston City | 6 | 3,284 | 3,379 | -0.73% | 1,552 | 2.1 | City |
| Cambria | 7 | 1,841 | 1,552 | 4.07% | 1,301 | 1.4 | Village |
| Carrier Mills | 8 | 1,585 | 1,665 | -1.25% | 1,312 | 1.2 | Village |
| Crainville | 9 | 1,483 | 1,442 | 0.68% | 897 | 1.7 | Village |
| De Soto | 10 | 1,374 | 1,400 | -0.51% | 1,507 | 0.9 | Village |
| Goreville | 11 | 1,059 | 1,063 | -0.09% | 394 | 2.7 | Village |
| Energy | 12 | 947 | 970 | -0.63% | 792 | 1.2 | Village |
| Galatia | 13 | 783 | 823 | -1.26% | 401 | 2.0 | Village |
| Hurst | 14 | 746 | 758 | -0.4% | 841 | 0.9 | City |
| Pittsburg | 15 | 556 | 566 | -0.54% | 269 | 2.1 | Village |
| Makanda | 16 | 527 | 537 | -0.57% | 100 | 5.3 | Village |
| Creal Springs | 17 | 494 | 505 | -0.6% | 481 | 1.0 | City |
| Thompsonville | 18 | 478 | 485 | -0.42% | 235 | 2.0 | Village |
| Blairsville | 19 | 327 | 322 | 7.92% | 324 | 1.0 | CDP |
| Hanaford | 20 | 313 | 319 | -0.64% | 311 | 1.0 | Village |
| Freeman Spur | 21 | 267 | 274 | -0.74% | 669 | 0.4 | Village |
| Crab Orchard | 22 | 247 | 222 | -2.37% | 177 | 1.4 | CDP |
| Bush | 23 | 237 | 241 | -0.42% | 521 | 0.5 | Village |
| Whiteash | 24 | 220 | 83 | 7.32% | 253 | 0.9 | CDP |
| Stonefort | 25 | 219 | 223 | -0.46% | 151 | 1.5 | Village |
| Spillertown | 26 | 176 | 180 | -0.56% | 548 | 0.3 | Village |
| Colp | 27 | 174 | 178 | -0.57% | 1,299 | 0.1 | Village |
| New Burnside | 28 | 153 | 153 | 0% | 146 | 1.0 | Village |
| Eddyville | 29 | 95 | 98 | -1.04% | 338 | 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.
Carbondale is the largest city in Williamson County.
Eddyville is the smallest city in Williamson County.
There are 29 cities in Williamson County, Illinois.