Rock Island, Illinois

Rock Island population, 2020 to 2024

Rock Island lost 576 residents from July 2020 to July 2024, a change of -1.6%. In the latest year it moved by +138. Among 330 Illinois places of 5,000 or more, that growth ranks 196th; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Rock Island is 2.5 times that size.

Rock Island covers 17.53 square miles of land and 0.21 of water, for 2,078 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Rock Island is close to the typical town.

What county Rock Island is in

All of Rock Island's residents live in Rock Island County, which had 142,731 residents in 2024. Rock Island holds 25.5% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Rock Island

1 ZIP Code Tabulation Area (ZCTA) overlaps Rock Island by at least 10% of the ZCTA's or the city's land: 61201. 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 Island is

The Census internal point of Rock Island is at 41.469400, -90.585300. Springfield, the capital, is 126.5 miles SSE in a straight line. The nearest larger place is Moline, IL (42,442 people), 4.8 miles away. The nearest city of 100,000 or more is Davenport, IA, 6.1 miles away.

Daylight in Rock Island

At 41.47° N, Rock Island gets about 15 h 11 min of daylight around the June solstice and 9 h 10 min around the December solstice, a swing of 6 h 00 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Rock Island

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Milan, 2.6 miles away, with 5,033 people.