34 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Joliet | 1 | 150,647 | 150,251 | 0.05% | 2,278 | 66.12 | City |
| Bolingbrook | 2 | 74,265 | 73,822 | 0.12% | 2,983 | 24.90 | Village |
| Plainfield | 3 | 49,111 | 44,953 | 1.72% | 1,928 | 25.48 | Village |
| Romeoville | 4 | 41,055 | 40,805 | 0.12% | 2,125 | 19.32 | Village |
| New Lenox | 5 | 28,573 | 27,258 | 0.93% | 1,813 | 15.76 | Village |
| Lockport | 6 | 26,795 | 26,149 | 0.48% | 2,286 | 11.72 | City |
| Homer Glen | 7 | 24,573 | 24,505 | 0.06% | 1,107 | 22.21 | Village |
| Frankfort | 8 | 21,301 | 20,315 | 0.93% | 1,364 | 15.62 | Village |
| Crest Hill | 9 | 19,920 | 20,415 | -0.5% | 2,219 | 8.98 | City |
| Mokena | 10 | 19,692 | 19,859 | -0.17% | 2,256 | 8.73 | Village |
| Shorewood | 11 | 18,495 | 18,179 | 0.34% | 2,288 | 8.09 | Village |
| Channahon | 12 | 14,580 | 13,475 | 1.54% | 893 | 16.33 | Village |
| Manhattan | 13 | 11,227 | 9,527 | 3.12% | 1,663 | 6.75 | Village |
| Crete | 14 | 8,237 | 8,434 | -0.47% | 875 | 9.42 | Village |
| University Park | 15 | 6,917 | 7,129 | -0.6% | 645 | 10.73 | Village |
| Braidwood | 16 | 6,163 | 6,187 | -0.08% | 1,164 | 5.30 | City |
| Wilmington | 17 | 5,514 | 5,648 | -0.49% | 393 | 14.03 | City |
| Monee | 18 | 5,085 | 5,115 | -0.12% | 1,137 | 4.47 | Village |
| Beecher | 19 | 4,675 | 4,705 | -0.13% | 1,707 | 2.74 | Village |
| Peotone | 20 | 4,209 | 4,153 | 0.26% | 2,089 | 2.02 | Village |
| Ridgewood | 21 | 4,052 | 3,089 | 7.14% | 9,209 | 0.44 | CDP |
| Ingalls Park | 22 | 3,049 | 3,022 | -0.59% | 2,747 | 1.11 | CDP |
| Fairmont | 23 | 2,629 | 2,690 | 0.42% | 1,890 | 1.39 | CDP |
| Preston Heights | 24 | 2,589 | 2,529 | 0.04% | 2,236 | 1.16 | CDP |
| Elwood | 25 | 2,183 | 2,223 | -0.36% | 160 | 13.65 | Village |
| Rockdale | 26 | 1,950 | 2,005 | -0.56% | 1,382 | 1.41 | Village |
| Arbury Hills | 27 | 1,794 | 1,637 | 7.17% | 10,022 | 0.18 | CDP |
| Bonnie Brae | 28 | 1,338 | 1,248 | 7.21% | 7,005 | 0.19 | CDP |
| Lockport Heights | 29 | 1,051 | 885 | 7.14% | 6,110 | 0.17 | CDP |
| Sunnyland | 30 | 640 | 565 | 7.2% | 3,216 | 0.20 | CDP |
| Plum Valley | 31 | 506 | 379 | 7.2% | 271 | 1.87 | CDP |
| Wilton Center | 32 | 197 | 127 | 7.07% | 357 | 0.55 | CDP |
| Wilmington | 33 | 86 | 91 | -1.15% | 109 | 0.79 | Village |
| Marley | 34 | 44 | 167 | 7.32% | 419 | 0.10 | CDP |
Joliet is the largest city in Will County, with a population of 150,647.
Marley is the smallest city in Will County.
There are 34 cities in Will County, Illinois.