Swansea, Illinois

Swansea population, 2020 to 2024

Swansea added 92 residents from July 2020 to July 2024, a change of +0.6%. In the latest year it moved by -81. Among 330 Illinois places of 5,000 or more, that growth ranks 83rd; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Swansea is 98% of it.

Swansea covers 6.48 square miles of land and 0.14 of water, for 2,229 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Swansea is close to the typical town.

What county Swansea is in

All of Swansea's residents live in St. Clair County, which had 251,149 residents in 2024. Swansea holds 5.8% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Swansea

1 ZIP Code Tabulation Area (ZCTA) overlaps Swansea by at least 10% of the ZCTA's or the village's land: 62226. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a village that annexed land after 2020 may reach into ZIP codes not listed here.

Where Swansea is

The Census internal point of Swansea is at 38.551800, -89.987500. Springfield, the capital, is 86.8 miles NNE in a straight line. The nearest larger place is Belleville, IL (40,560 people), 2.5 miles away. The nearest city of 100,000 or more is St. Louis, MO, 15.0 miles away.

Daylight in Swansea

At 38.55° N, Swansea gets about 14 h 52 min of daylight around the June solstice and 9 h 28 min around the December solstice, a swing of 5 h 23 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Swansea

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Belleville, 2.5 miles away, with 40,560 people.