Monticello, Illinois

Monticello population, 2020 to 2024

Monticello added 62 residents from July 2020 to July 2024, a change of +1.0%. In the latest year it moved by -10. Among 330 Illinois places of 5,000 or more, that growth ranks 66th; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Monticello is 41% of it.

Monticello covers 4.03 square miles of land and 0.04 of water, for 1,491 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Monticello is less dense than the typical town.

What county Monticello is in

All of Monticello's residents live in Piatt County, which had 16,628 residents in 2024. Monticello holds 36.1% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Monticello

1 ZIP Code Tabulation Area (ZCTA) overlaps Monticello by at least 10% of the ZCTA's or the city's land: 61856. 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 Monticello is

The Census internal point of Monticello is at 40.033500, -88.574100. Springfield, the capital, is 59.6 miles WSW in a straight line. The nearest larger place is Mahomet, IL (10,619 people), 14.5 miles away. The nearest city of 100,000 or more is Springfield, IL, 59.2 miles away.

Daylight in Monticello

At 40.03° N, Monticello gets about 15 h 01 min of daylight around the June solstice and 9 h 19 min around the December solstice, a swing of 5 h 42 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Monticello

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Bement, 7.6 miles away, with 1,452 people.