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 |
|---|---|---|---|---|---|---|---|
| Joliet | 1 | 150,568 | 150,251 | 0.05% | 2,277 | 66.1 | City |
| Bolingbrook | 2 | 74,176 | 73,822 | 0.12% | 2,979 | 24.9 | Village |
| Plainfield | 3 | 48,279 | 44,953 | 1.75% | 1,895 | 25.5 | Village |
| Romeoville | 4 | 41,005 | 40,805 | 0.12% | 2,123 | 19.3 | Village |
| New Lenox | 5 | 28,310 | 27,258 | 0.94% | 1,797 | 15.8 | Village |
| Lockport | 6 | 26,666 | 26,149 | 0.49% | 2,275 | 11.7 | City |
| Homer Glen | 7 | 24,559 | 24,505 | 0.05% | 1,106 | 22.2 | Village |
| Frankfort | 8 | 21,104 | 20,315 | 0.94% | 1,352 | 15.6 | Village |
| Crest Hill | 9 | 20,019 | 20,415 | -0.49% | 2,230 | 9.0 | City |
| Mokena | 10 | 19,725 | 19,859 | -0.17% | 2,259 | 8.7 | Village |
| Shorewood | 11 | 18,432 | 18,179 | 0.34% | 2,280 | 8.1 | Village |
| Channahon | 12 | 14,359 | 13,475 | 1.56% | 879 | 16.3 | Village |
| Manhattan | 13 | 10,887 | 9,527 | 3.22% | 1,613 | 6.8 | Village |
| Crete | 14 | 8,276 | 8,434 | -0.48% | 879 | 9.4 | Village |
| University Park | 15 | 6,959 | 7,129 | -0.61% | 649 | 10.7 | Village |
| Braidwood | 16 | 6,168 | 6,187 | -0.08% | 1,165 | 5.3 | City |
| Wilmington | 17 | 5,541 | 5,648 | -0.48% | 395 | 14.0 | City |
| Monee | 18 | 5,091 | 5,115 | -0.12% | 1,138 | 4.5 | Village |
| Beecher | 19 | 4,681 | 4,705 | -0.13% | 1,710 | 2.7 | Village |
| Peotone | 20 | 4,198 | 4,153 | 0.26% | 2,083 | 2.0 | Village |
| Ridgewood | 21 | 3,782 | 3,089 | 7.69% | 8,595 | 0.4 | CDP |
| Ingalls Park | 22 | 3,067 | 3,022 | -0.55% | 2,763 | 1.1 | CDP |
| Fairmont | 23 | 2,618 | 2,690 | 0.46% | 1,882 | 1.4 | CDP |
| Preston Heights | 24 | 2,588 | 2,529 | 0.04% | 2,235 | 1.2 | CDP |
| Elwood | 25 | 2,191 | 2,223 | -0.36% | 161 | 13.6 | Village |
| Rockdale | 26 | 1,961 | 2,005 | -0.56% | 1,390 | 1.4 | Village |
| Arbury Hills | 27 | 1,674 | 1,637 | 7.65% | 9,352 | 0.2 | CDP |
| Bonnie Brae | 28 | 1,248 | 1,248 | 7.68% | 6,534 | 0.2 | CDP |
| Lockport Heights | 29 | 981 | 885 | 7.68% | 5,703 | 0.2 | CDP |
| Sunnyland | 30 | 597 | 565 | 7.57% | 3,000 | 0.2 | CDP |
| Plum Valley | 31 | 472 | 379 | 7.52% | 253 | 1.9 | CDP |
| Wilton Center | 32 | 184 | 127 | 7.6% | 333 | 0.6 | CDP |
| Wilmington | 33 | 87 | 91 | -1.14% | 111 | 0.8 | Village |
| Marley | 34 | 41 | 167 | 7.9% | 390 | 0.1 | 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.
Joliet is the largest city in Will County.
Marley is the smallest city in Will County.
There are 34 cities in Will County, Illinois.