St. Elmo, Illinois

St. Elmo population, 2020 to 2024

St. Elmo lost 24 residents from July 2020 to July 2024, a change of -1.9%. In the latest year it moved by -5.

St. Elmo covers 1.48 square miles of land and 0.02 of water, for 840 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so St. Elmo is less dense than the typical town.

What county St. Elmo is in

All of St. Elmo's residents live in Fayette County, which had 21,157 residents in 2024. St. Elmo holds 5.9% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in St. Elmo

1 ZIP Code Tabulation Area (ZCTA) overlaps St. Elmo by at least 10% of the ZCTA's or the city's land: 62458. 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 St. Elmo is

The Census internal point of St. Elmo is at 39.021800, -88.851400. Springfield, the capital, is 67.6 miles NW in a straight line. The nearest larger place is Altamont, IL (2,200 people), 6.1 miles away. The nearest city of 100,000 or more is Springfield, IL, 68.0 miles away.

Daylight in St. Elmo

At 39.02° N, St. Elmo gets about 14 h 55 min of daylight around the June solstice and 9 h 26 min around the December solstice, a swing of 5 h 29 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near St. Elmo

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Altamont, 6.1 miles away, with 2,200 people.