There are 34 cities in Ogle 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 |
| Dixon | 2 | Illinois | 15,042 | 15,256 | -0.36% | 1,774 | 8.48 |
| Rochelle | 3 | Illinois | 9,281 | 9,432 | -0.41% | 675 | 13.76 |
| Byron | 4 | Illinois | 3,768 | 3,784 | -0.11% | 810 | 4.65 |
| Oregon | 5 | Illinois | 3,549 | 3,616 | -0.48% | 1,842 | 1.93 |
| Winnebago | 6 | Illinois | 2,859 | 2,922 | -0.56% | 1,478 | 1.93 |
| Cherry Valley | 7 | Illinois | 2,853 | 2,896 | -0.38% | 339 | 8.40 |
| Mount Morris | 8 | Illinois | 2,796 | 2,848 | -0.46% | 1,792 | 1.56 |
| Davis Junction | 9 | Illinois | 2,545 | 2,511 | 0.32% | 606 | 4.20 |
| Polo | 10 | Illinois | 2,242 | 2,281 | -0.44% | 1,545 | 1.45 |
| Amboy | 11 | Illinois | 2,223 | 2,275 | -0.58% | 358 | 6.21 |
| Kirkland | 12 | Illinois | 1,608 | 1,648 | -0.62% | 1,295 | 1.24 |
| Forreston | 13 | Illinois | 1,402 | 1,432 | -0.57% | 1,487 | 0.94 |
| Westlake Village | 14 | Illinois | 1,218 | 1,744 | -8.56% | 1,322 | 0.92 |
| Hillcrest | 15 | Illinois | 1,210 | 1,221 | -0.25% | 341 | 3.55 |
| Stillman Valley | 16 | Illinois | 1,056 | 1,072 | -0.38% | 1,853 | 0.57 |
| Milledgeville | 17 | Illinois | 995 | 1,023 | -0.7% | 1,442 | 0.69 |
| Ashton | 18 | Illinois | 940 | 966 | -0.74% | 1,304 | 0.72 |
| Lake Carroll | 19 | Illinois | 902 | 500 | 8.67% | 67 | 13.55 |
| Lost Nation | 20 | Illinois | 886 | 570 | 9.79% | 363 | 2.44 |
| Franklin Grove | 21 | Illinois | 873 | 897 | -0.68% | 2,099 | 0.42 |
| Shannon | 22 | Illinois | 864 | 800 | 1.89% | 1,793 | 0.48 |
| New Milford | 23 | Illinois | 789 | 793 | -0.13% | 306 | 2.58 |
| Creston | 24 | Illinois | 616 | 627 | -0.48% | 538 | 1.15 |
| Leaf River | 25 | Illinois | 421 | 429 | -0.47% | 484 | 0.87 |
| German Valley | 26 | Illinois | 412 | 432 | -1.2% | 886 | 0.47 |
| Monroe Center | 27 | Illinois | 404 | 412 | -0.49% | 333 | 1.21 |
| Kings | 28 | Illinois | 346 | 348 | 0% | 2,261 | 0.15 |
| Grand Detour | 29 | Illinois | 253 | 351 | -8.66% | 216 | 1.17 |
| Holcomb | 30 | Illinois | 177 | 157 | 2.91% | 1,989 | 0.09 |
| Nachusa | 31 | Illinois | 154 | 122 | 5.48% | 202 | 0.76 |
| Baileyville | 32 | Illinois | 148 | 126 | 4.23% | 612 | 0.24 |
| Nelson | 33 | Illinois | 123 | 126 | -0.81% | 345 | 0.36 |
| Adeline | 34 | 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 Ogle County.
Adeline is the smallest city in Ogle County.
There are 34 cities in Ogle County, Illinois.