57 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 |
| Wheatland township | 2 | 91,595 | 88,836 | 0.71% | 2,583 | 35.45 | Township |
| Du Page township | 3 | 87,320 | 87,259 | -0.04% | 2,423 | 36.04 | Township |
| Joliet township | 4 | 84,858 | 85,260 | 0.04% | 2,405 | 35.28 | Township |
| Plainfield township | 5 | 84,551 | 82,177 | 0.75% | 2,546 | 33.21 | Township |
| Bolingbrook | 6 | 74,265 | 73,822 | 0.12% | 2,983 | 24.90 | Village |
| Frankfort township | 7 | 60,345 | 59,753 | 0.31% | 1,641 | 36.78 | Township |
| Lockport township | 8 | 59,840 | 59,755 | 0.18% | 1,679 | 35.64 | Township |
| Plainfield | 9 | 49,111 | 44,953 | 1.72% | 1,928 | 25.48 | Village |
| New Lenox township | 10 | 45,193 | 43,718 | 0.94% | 1,259 | 35.89 | Township |
| Romeoville | 11 | 41,055 | 40,805 | 0.12% | 2,125 | 19.32 | Village |
| New Lenox | 12 | 28,573 | 27,258 | 0.93% | 1,813 | 15.76 | Village |
| Lockport | 13 | 26,795 | 26,149 | 0.48% | 2,286 | 11.72 | City |
| Homer Glen | 14 | 24,573 | 24,505 | 0.06% | 1,107 | 22.21 | Village |
| Crete township | 15 | 23,260 | 23,714 | -0.22% | 526 | 44.22 | Township |
| Frankfort | 16 | 21,301 | 20,315 | 0.93% | 1,364 | 15.62 | Village |
| Crest Hill | 17 | 19,920 | 20,415 | -0.49% | 2,219 | 8.98 | City |
| Mokena | 18 | 19,692 | 19,859 | -0.17% | 2,256 | 8.73 | Village |
| Shorewood | 19 | 18,495 | 18,179 | 0.34% | 2,288 | 8.09 | Village |
| Monee township | 20 | 15,289 | 15,507 | -0.1% | 427 | 35.80 | Township |
| Channahon | 21 | 14,580 | 13,475 | 1.54% | 893 | 16.33 | Village |
| Manhattan township | 22 | 13,107 | 11,708 | 1.58% | 356 | 36.84 | Township |
| Manhattan | 23 | 11,227 | 9,527 | 3.12% | 1,663 | 6.75 | Village |
| Channahon township | 24 | 11,000 | 10,540 | 0.78% | 331 | 33.23 | Township |
| Crete | 25 | 8,237 | 8,434 | -0.47% | 875 | 9.42 | Village |
| Reed township | 26 | 6,952 | 6,861 | 0.4% | 407 | 17.08 | Township |
| University Park | 27 | 6,917 | 7,129 | -0.6% | 645 | 10.73 | Village |
| Frankfort township | 28 | 6,256 | 6,402 | -0.33% | 172 | 36.47 | Township |
| Braidwood | 29 | 6,163 | 6,187 | -0.08% | 1,164 | 5.30 | City |
| Wilmington township | 30 | 5,833 | 5,941 | -0.22% | 177 | 33.03 | Township |
| Wilmington | 31 | 5,514 | 5,648 | -0.49% | 393 | 14.03 | City |
| Monee | 32 | 5,085 | 5,115 | -0.12% | 1,137 | 4.47 | Village |
| Beecher | 33 | 4,675 | 4,705 | -0.13% | 1,707 | 2.74 | Village |
| Peotone township | 34 | 4,407 | 4,365 | 0.2% | 122 | 36.26 | Township |
| Peotone | 35 | 4,209 | 4,153 | 0.26% | 2,089 | 2.02 | Village |
| Ridgewood | 36 | 4,052 | 3,089 | 7.14% | 9,209 | 0.44 | CDP |
| Jackson township | 37 | 3,836 | 3,887 | -0.05% | 106 | 36.17 | Township |
| Green Garden township | 38 | 3,835 | 3,881 | -0.05% | 105 | 36.68 | Township |
| Ingalls Park | 39 | 3,049 | 3,022 | -0.59% | 2,747 | 1.11 | CDP |
| Fairmont | 40 | 2,629 | 2,690 | 0.42% | 1,890 | 1.39 | CDP |
| Preston Heights | 41 | 2,589 | 2,529 | 0.04% | 2,236 | 1.16 | CDP |
| Elwood | 42 | 2,183 | 2,223 | -0.37% | 160 | 13.65 | Village |
| Wesley township | 43 | 2,071 | 2,115 | -0.29% | 74 | 27.86 | Township |
| Rockdale | 44 | 1,950 | 2,005 | -0.56% | 1,382 | 1.41 | Village |
| Arbury Hills | 45 | 1,794 | 1,637 | 7.17% | 10,022 | 0.18 | CDP |
| Will township | 46 | 1,776 | 1,791 | -0.11% | 49 | 36.21 | Township |
| Elwood township | 47 | 1,378 | 1,444 | -0.65% | 55 | 24.83 | Township |
| Bonnie Brae | 48 | 1,338 | 1,248 | 7.21% | 7,005 | 0.19 | CDP |
| Custer township | 49 | 1,336 | 1,360 | -0.22% | 52 | 25.78 | Township |
| Lockport Heights | 50 | 1,051 | 885 | 7.14% | 6,110 | 0.17 | CDP |
| Florence township | 51 | 912 | 930 | -0.22% | 25 | 36.48 | Township |
| Wilton township | 52 | 776 | 792 | -0.26% | 21 | 36.37 | Township |
| Sunnyland | 53 | 640 | 565 | 7.2% | 3,216 | 0.20 | CDP |
| Plum Valley | 54 | 506 | 379 | 7.2% | 271 | 1.87 | CDP |
| Wilton Center | 55 | 197 | 127 | 7.07% | 357 | 0.55 | CDP |
| Wilmington | 56 | 86 | 91 | -1.15% | 109 | 0.79 | Village |
| Marley | 57 | 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 57 cities in Will County, Illinois.