There are 29 cities in Rock Island 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 | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Moline | 1 | 41,654 | 42,897 | -0.74% | 2,486 | 16.8 | City |
| Rock Island | 2 | 35,836 | 37,019 | -0.82% | 2,124 | 16.9 | City |
| East Moline | 3 | 20,634 | 21,322 | -0.83% | 1,414 | 14.6 | City |
| Silvis | 4 | 7,864 | 7,991 | -0.4% | 1,835 | 4.3 | City |
| Colona | 5 | 4,957 | 5,036 | -0.4% | 1,298 | 3.8 | City |
| Milan | 6 | 4,928 | 5,088 | -0.8% | 788 | 6.3 | Village |
| Coal Valley | 7 | 3,800 | 3,864 | -0.42% | 1,200 | 3.2 | Village |
| Carbon Cliff | 8 | 1,775 | 1,841 | -0.95% | 847 | 2.1 | Village |
| Hampton | 9 | 1,726 | 1,774 | -0.69% | 1,181 | 1.5 | Village |
| Orion | 10 | 1,717 | 1,755 | -0.58% | 1,836 | 0.9 | Village |
| Port Byron | 11 | 1,614 | 1,664 | -0.8% | 665 | 2.4 | Village |
| Andalusia | 12 | 1,151 | 1,181 | -0.69% | 980 | 1.2 | Village |
| Coyne Center | 13 | 968 | 1,102 | 1.04% | 563 | 1.7 | CDP |
| Rapids City | 14 | 931 | 958 | -0.75% | 573 | 1.6 | Village |
| Sherrard | 15 | 689 | 693 | -0.14% | 742 | 0.9 | Village |
| Cordova | 16 | 650 | 674 | -0.92% | 1,132 | 0.6 | Village |
| New Boston | 17 | 610 | 612 | -0.16% | 648 | 0.9 | City |
| Campbell's Island | 18 | 486 | 343 | 7.52% | 1,070 | 0.5 | CDP |
| Edgington | 19 | 484 | 195 | 7.56% | 478 | 1.0 | CDP |
| Reynolds | 20 | 479 | 499 | -1.03% | 1,302 | 0.4 | Village |
| Oak Grove | 21 | 462 | 469 | -0.43% | 702 | 0.7 | Village |
| Rock Island Arsenal | 22 | 413 | 353 | 4.82% | 263 | 1.6 | CDP |
| Hillsdale | 23 | 405 | 413 | -0.49% | 625 | 0.6 | Village |
| Preemption | 24 | 177 | 172 | 7.27% | 159 | 1.1 | CDP |
| Taylor Ridge | 25 | 153 | 142 | 7.75% | 99 | 1.6 | CDP |
| Cable | 26 | 122 | 103 | 7.02% | 107 | 1.1 | CDP |
| Barstow | 27 | 76 | 73 | 8.57% | 717 | 0.1 | CDP |
| Joslin | 28 | 69 | 30 | 7.81% | 15 | 4.6 | CDP |
| Illinois City | 29 | 43 | 58 | 7.5% | 94 | 0.5 | CDP |
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.
Moline is the largest city in Rock Island County.
Illinois City is the smallest city in Rock Island County.
There are 29 cities in Rock Island County, Illinois.