Cairo, Illinois

Cairo population, 2020 to 2024

Cairo lost 193 residents from July 2020 to July 2024, a change of -11.2%. In the latest year it moved by -43.

Cairo covers 6.99 square miles of land and 2.12 of water, for 218 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Cairo is less dense than the typical town.

What county Cairo is in

All of Cairo's residents live in Alexander County, which had 4,594 residents in 2024. Cairo holds 33.2% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Cairo

1 ZIP Code Tabulation Area (ZCTA) overlaps Cairo by at least 10% of the ZCTA's or the city's land: 62914. 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 Cairo is

The Census internal point of Cairo is at 37.006300, -89.182900. Springfield, the capital, is 193.4 miles N in a straight line. The nearest larger place is Charleston, MO (4,447 people), 10.4 miles away. The nearest city of 100,000 or more is Clarksville, TN, 106.1 miles away.

Daylight in Cairo

At 37.01° N, Cairo gets about 14 h 42 min of daylight around the June solstice and 9 h 37 min around the December solstice, a swing of 5 h 05 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Cairo

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Metropolis, 29.1 miles away, with 5,776 people.