17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Dixon | 1 | 14,989 | 15,256 | -0.35% | 1,768 | 8.48 | City |
| Amboy | 2 | 2,210 | 2,275 | -0.58% | 356 | 6.21 | City |
| Ashton | 3 | 934 | 966 | -0.64% | 1,295 | 0.72 | Village |
| Franklin Grove | 4 | 867 | 897 | -0.69% | 2,084 | 0.42 | Village |
| Paw Paw | 5 | 800 | 827 | -0.62% | 1,336 | 0.60 | Village |
| Lost Nation | 6 | 733 | 570 | 0.27% | 300 | 2.44 | CDP |
| Como | 7 | 610 | 525 | 0.49% | 572 | 1.07 | CDP |
| Sublette | 8 | 370 | 379 | -0.54% | 925 | 0.40 | Village |
| Lee | 9 | 301 | 313 | -0.66% | 1,520 | 0.20 | Village |
| Grand Detour | 10 | 270 | 351 | -3.91% | 231 | 1.17 | CDP |
| Compton | 11 | 263 | 270 | -0.38% | 1,594 | 0.17 | Village |
| Steward | 12 | 222 | 227 | -0.45% | 1,682 | 0.13 | Village |
| Nachusa | 13 | 172 | 122 | 6.83% | 225 | 0.76 | CDP |
| Coleta | 14 | 158 | 163 | -0.63% | 427 | 0.37 | Village |
| West Brooklyn | 15 | 127 | 131 | -0.78% | 1,351 | 0.09 | Village |
| Nelson | 16 | 122 | 126 | -0.81% | 342 | 0.36 | Village |
| Harmon | 17 | 115 | 119 | -0.86% | 528 | 0.22 | Village |
Dixon is the largest city in Lee County, with a population of 14,989.
Harmon is the smallest city in Lee County.
There are 17 cities in Lee County, Illinois.