34 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Elgin | 1 | 112,438 | 114,617 | -0.39% | 2,948 | 38.14 | City |
| Elgin township | 2 | 104,617 | 104,364 | 0.31% | 3,278 | 31.92 | Township |
| Dundee township | 3 | 63,442 | 64,803 | -0.36% | 1,818 | 34.89 | Township |
| St. Charles township | 4 | 51,314 | 51,851 | -0.09% | 1,483 | 34.60 | Township |
| Carpentersville | 5 | 36,559 | 37,909 | -0.73% | 4,648 | 7.87 | Village |
| Batavia township | 6 | 36,124 | 35,377 | 0.77% | 1,974 | 18.30 | Township |
| St. Charles | 7 | 32,400 | 33,034 | -0.39% | 2,241 | 14.46 | City |
| Batavia | 8 | 26,181 | 26,316 | -0.1% | 2,407 | 10.88 | City |
| Geneva township | 9 | 25,905 | 26,347 | -0.35% | 1,610 | 16.09 | Township |
| South Elgin | 10 | 24,560 | 23,852 | 0.58% | 3,379 | 7.27 | Village |
| Sugar Grove township | 11 | 21,049 | 20,708 | 0.16% | 597 | 35.24 | Township |
| Geneva | 12 | 20,981 | 21,350 | -0.35% | 2,103 | 9.98 | City |
| North Aurora | 13 | 19,513 | 18,285 | 1.28% | 2,575 | 7.58 | Village |
| Blackberry township | 14 | 17,828 | 17,308 | 0.93% | 510 | 34.92 | Township |
| Campton township | 15 | 17,147 | 17,070 | 0.33% | 500 | 34.31 | Township |
| Campton Hills | 16 | 10,740 | 10,877 | -0.25% | 636 | 16.89 | Village |
| Boulder Hill | 17 | 9,907 | 9,081 | 1.23% | 6,795 | 1.46 | CDP |
| Hampshire township | 18 | 9,732 | 8,922 | 2.41% | 271 | 35.87 | Township |
| Sugar Grove | 19 | 9,177 | 9,259 | -0.17% | 869 | 10.56 | Village |
| Plato township | 20 | 9,154 | 9,243 | 0.01% | 273 | 33.48 | Township |
| Gilberts | 21 | 9,037 | 8,374 | 1.49% | 1,646 | 5.49 | Village |
| Hampshire | 22 | 8,379 | 7,646 | 1.79% | 871 | 9.62 | Village |
| West Dundee | 23 | 7,884 | 7,868 | 0.04% | 1,976 | 3.99 | Village |
| Elburn | 24 | 6,793 | 6,208 | 1.75% | 1,811 | 3.75 | Village |
| Sleepy Hollow | 25 | 3,085 | 3,199 | -0.74% | 1,539 | 2 | Village |
| Prestbury | 26 | 2,194 | 1,978 | 1.43% | 3,505 | 0.63 | CDP |
| Virgil township | 27 | 1,879 | 1,903 | -0.53% | 54 | 35.02 | Township |
| Burlington township | 28 | 1,758 | 1,806 | -0.4% | 52 | 33.78 | Township |
| Big Rock township | 29 | 1,728 | 1,778 | -0.46% | 49 | 35.15 | Township |
| Maple Park | 30 | 1,508 | 1,432 | 1% | 659 | 2.29 | Village |
| Kaneville township | 31 | 1,121 | 1,153 | -0.44% | 32 | 35.11 | Township |
| Big Rock | 32 | 1,070 | 1,105 | -0.65% | 248 | 4.32 | Village |
| Burlington | 33 | 515 | 535 | -0.77% | 75 | 6.86 | Village |
| Kaneville | 34 | 439 | 453 | -0.68% | 1,540 | 0.28 | Village |
Elgin is the largest city in Kane County, with a population of 112,438.
Kaneville is the smallest city in Kane County.
There are 34 cities in Kane County, Illinois.