Marion, Illinois

Marion population, 2020 to 2024

Marion added 190 residents from July 2020 to July 2024, a change of +1.1%. In the latest year it moved by +163. Among 330 Illinois places of 5,000 or more, that growth ranks 64th; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Marion is 1.2 times that size.

Marion covers 14.40 square miles of land and 0.22 of water, for 1,182 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Marion is less dense than the typical town.

What county Marion is in

All of Marion's residents live in Williamson County, which had 67,064 residents in 2024. Marion holds 25.4% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Marion

1 ZIP Code Tabulation Area (ZCTA) overlaps Marion by at least 10% of the ZCTA's or the city's land: 62959. 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 Marion is

The Census internal point of Marion is at 37.734400, -88.941200. Springfield, the capital, is 146.5 miles NNW in a straight line. The nearest larger place is Carbondale, IL (22,223 people), 15.5 miles away. The nearest city of 100,000 or more is Evansville, IN, 78.7 miles away.

Daylight in Marion

At 37.73° N, Marion gets about 14 h 47 min of daylight around the June solstice and 9 h 33 min around the December solstice, a swing of 5 h 14 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Marion

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Johnston City, 6.0 miles away, with 3,309 people.