Rock Falls, Illinois

Rock Falls population, 2020 to 2024

Rock Falls lost 157 residents from July 2020 to July 2024, a change of -1.8%. In the latest year it moved by +1. Among 330 Illinois places of 5,000 or more, that growth ranks 212th; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Rock Falls is 58% of it.

Rock Falls covers 3.98 square miles of land and 0.14 of water, for 2,164 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Rock Falls is close to the typical town.

What county Rock Falls is in

All of Rock Falls's residents live in Whiteside County, which had 54,657 residents in 2024. Rock Falls holds 15.8% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Rock Falls

1 ZIP Code Tabulation Area (ZCTA) overlaps Rock Falls by at least 10% of the ZCTA's or the city's land: 61071. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Rock Falls is

The Census internal point of Rock Falls is at 41.772100, -89.694200. Springfield, the capital, is 137.6 miles S in a straight line. The nearest larger place is Sterling, IL (14,535 people), 1.9 miles away. The nearest city of 100,000 or more is Rockford, IL, 46.7 miles away.

Daylight in Rock Falls

At 41.77° N, Rock Falls gets about 15 h 13 min of daylight around the June solstice and 9 h 08 min around the December solstice, a swing of 6 h 05 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Rock Falls

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Sterling, 1.9 miles away, with 14,535 people.