There are 35 cities in Grundy 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) |
|---|---|---|---|---|---|---|---|
| Joliet | 1 | Illinois | 150,568 | 150,251 | 0.05% | 2,277 | 66.12 |
| Yorkville | 2 | Illinois | 25,697 | 21,681 | 4.07% | 1,285 | 20 |
| Morris | 3 | Illinois | 14,606 | 14,212 | 0.68% | 1,179 | 12.39 |
| Channahon | 4 | Illinois | 14,359 | 13,475 | 1.56% | 879 | 16.33 |
| Minooka | 5 | Illinois | 12,918 | 12,760 | 0.3% | 1,376 | 9.39 |
| Braidwood | 6 | Illinois | 6,168 | 6,187 | -0.08% | 1,165 | 5.30 |
| Coal City | 7 | Illinois | 5,813 | 5,697 | 0.5% | 1,008 | 5.77 |
| Wilmington | 8 | Illinois | 5,541 | 5,648 | -0.48% | 395 | 14.03 |
| Dwight | 9 | Illinois | 4,035 | 4,029 | 0.03% | 1,044 | 3.86 |
| Diamond | 10 | Illinois | 2,700 | 2,627 | 0.67% | 1,421 | 1.90 |
| Seneca | 11 | Illinois | 2,300 | 2,343 | -0.48% | 371 | 6.21 |
| Elwood | 12 | Illinois | 2,191 | 2,223 | -0.36% | 161 | 13.65 |
| Gardner | 13 | Illinois | 1,364 | 1,358 | 0.07% | 468 | 2.91 |
| Newark | 14 | Illinois | 989 | 976 | 0.3% | 880 | 1.12 |
| Mazon | 15 | Illinois | 980 | 978 | 0% | 1,628 | 0.60 |
| Essex | 16 | Illinois | 858 | 842 | 0.47% | 369 | 2.33 |
| Braceville | 17 | Illinois | 723 | 721 | 0% | 232 | 3.11 |
| South Wilmington | 18 | Illinois | 719 | 705 | 0.42% | 1,461 | 0.49 |
| Godley | 19 | Illinois | 648 | 572 | 3.02% | 598 | 1.08 |
| Millington | 20 | Illinois | 622 | 618 | 0.16% | 879 | 0.71 |
| Lakewood Shores | 21 | Illinois | 534 | 566 | -1.48% | 1,534 | 0.35 |
| Rest Haven | 22 | Illinois | 505 | 550 | 0.6% | 738 | 0.68 |
| Custer Park | 23 | Illinois | 448 | 497 | 0.45% | 2,854 | 0.16 |
| Carbon Hill | 24 | Illinois | 384 | 375 | 0.52% | 2,110 | 0.18 |
| Ransom | 25 | Illinois | 306 | 310 | -0.33% | 306 | 1 |
| Millbrook | 26 | Illinois | 281 | 277 | 0.36% | 152 | 1.85 |
| Lisbon | 27 | Illinois | 276 | 271 | 0.36% | 130 | 2.12 |
| Plattville | 28 | Illinois | 223 | 219 | 0.45% | 99 | 2.26 |
| Verona | 29 | Illinois | 211 | 206 | 0.48% | 1,279 | 0.17 |
| Reddick | 30 | Illinois | 192 | 198 | -1.03% | 803 | 0.24 |
| Ritchie | 31 | Illinois | 144 | 164 | -3.36% | 139 | 1.03 |
| Symerton | 32 | Illinois | 123 | 126 | -0.81% | 783 | 0.16 |
| Kinsman | 33 | Illinois | 90 | 90 | 0% | 1,324 | 0.07 |
| Lorenzo | 34 | Illinois | 89 | 31 | 20.27% | 288 | 0.31 |
| East Brooklyn | 35 | Illinois | 82 | 80 | 0% | 1,577 | 0.05 |
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.
Joliet is the largest city in Grundy County.
East Brooklyn is the smallest city in Grundy County.
There are 35 cities in Grundy County, Illinois.