There are 25 cities in Winnebago County, Illinois.
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 | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Rockford | 1 | Illinois | 145,270 | 148,670 | -0.58% | 2,232 | 65.08 |
| Belvidere | 2 | Illinois | 25,301 | 25,283 | 0.02% | 2,022 | 12.51 |
| Loves Park | 3 | Illinois | 23,312 | 23,404 | -0.1% | 1,428 | 16.32 |
| Machesney Park | 4 | Illinois | 22,529 | 22,932 | -0.45% | 1,776 | 12.69 |
| Roscoe | 5 | Illinois | 10,805 | 10,957 | -0.35% | 1,053 | 10.27 |
| South Beloit | 6 | Illinois | 7,865 | 7,975 | -0.36% | 1,280 | 6.14 |
| Rockton | 7 | Illinois | 7,740 | 7,851 | -0.36% | 1,128 | 6.86 |
| Poplar Grove | 8 | Illinois | 5,153 | 5,056 | 0.47% | 654 | 7.88 |
| Candlewick Lake | 9 | Illinois | 4,932 | 5,351 | -1.48% | 2,667 | 1.85 |
| Winnebago | 10 | Illinois | 2,859 | 2,922 | -0.56% | 1,478 | 1.93 |
| Cherry Valley | 11 | Illinois | 2,853 | 2,896 | -0.38% | 339 | 8.40 |
| Davis Junction | 12 | Illinois | 2,545 | 2,511 | 0.32% | 606 | 4.20 |
| Lake Summerset | 13 | Illinois | 2,272 | 1,958 | 3.6% | 1,072 | 2.12 |
| Pecatonica | 14 | Illinois | 2,029 | 2,080 | -0.64% | 1,581 | 1.28 |
| Durand | 15 | Illinois | 1,364 | 1,390 | -0.51% | 1,484 | 0.92 |
| Westlake Village | 16 | Illinois | 1,218 | 1,744 | -8.56% | 1,322 | 0.92 |
| Stillman Valley | 17 | Illinois | 1,056 | 1,072 | -0.38% | 1,853 | 0.57 |
| Timberlane | 18 | Illinois | 902 | 904 | -0.11% | 517 | 1.75 |
| Argyle | 19 | Illinois | 799 | 353 | 16.3% | 911 | 0.88 |
| New Milford | 20 | Illinois | 789 | 793 | -0.13% | 306 | 2.58 |
| Davis | 21 | Illinois | 564 | 590 | -1.23% | 1,379 | 0.41 |
| Leaf River | 22 | Illinois | 421 | 429 | -0.47% | 484 | 0.87 |
| Caledonia | 23 | Illinois | 179 | 182 | -0.56% | 173 | 1.03 |
| Holcomb | 24 | Illinois | 177 | 157 | 2.91% | 1,989 | 0.09 |
| Adeline | 25 | Illinois | 74 | 76 | -1.33% | 278 | 0.27 |
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.
Rockford is the largest city in Winnebago County.
Adeline is the smallest city in Winnebago County.
There are 25 cities in Winnebago County, Illinois.