| City : | Rock Falls City |
| County : | Whiteside County |
| State : | Illinois (IL) |
| | |
| Land Area : | 3.66 sq mi |
| Water Area : | 0.13 sq mi |
| Latitude : | 41.7734391 |
| Longitude : | -89.6908904 |
| | |
| Population (2010): | 9,266 |
| Population Estimate (2012) : | 9,075 |
| Population Density : | 2,535.15/sq mi |
| Housing Units (2012) : | 4,123 |
| Median Household Income (2012) : | $35,432 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $41,347 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $79,000 (Illinois : $190,800, USA : $181,400) |