Lanark, Illinois

Lanark population, 2020 to 2024

Lanark lost 47 residents from July 2020 to July 2024, a change of -3.1%. In the latest year it moved by -8.

Lanark covers 1.12 square miles of land, for 1,306 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Lanark is less dense than the typical town.

What county Lanark is in

All of Lanark's residents live in Carroll County, which had 15,444 residents in 2024. Lanark holds 9.5% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Lanark

1 ZIP Code Tabulation Area (ZCTA) overlaps Lanark by at least 10% of the ZCTA's or the city's land: 61046. 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 Lanark is

The Census internal point of Lanark is at 42.101900, -89.833400. Springfield, the capital, is 160.6 miles S in a straight line. The nearest larger place is Polo, IL (2,238 people), 15.3 miles away. The nearest city of 100,000 or more is Rockford, IL, 40.9 miles away.

Daylight in Lanark

At 42.10° N, Lanark gets about 15 h 15 min of daylight around the June solstice and 9 h 06 min around the December solstice, a swing of 6 h 09 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Lanark

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Mount Carroll, 7.4 miles away, with 1,433 people.