Home > IL > Piatt County > Monticello > Zip 61856

Zip Code 61856 — Monticello, IL

ZIP Code 61856 is associated with Monticello, IL, in Piatt County. The listed population estimate is 8,226; estimated density is 29.4 people per square mile. Among records with population estimates, it ranks #1 of 11 in Piatt County and #400 of 1,390 in IL.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (40.028380, -88.582110)

Data MetricLocal Statistic
Postal / Zip Code61856
Primary CityMonticello
State / ProvinceIL
CountyPiatt
Total Population8,226
Population Density29.4 people/sq mi
TimezoneAmerica/Chicago

How 61856 Compares

MetricZIP 61856Piatt County recordsIL records
Population estimate8,22617,335 (sum)12,694,745 (sum)
Population Density29.4 /sq mi----
County population rank#1 of 11----
State population rank#400 of 1,390----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in IL

ZIP CodeCityDistancePopulation estimate
ZIP 61884White Heath6.8 mi973
ZIP 61839De Land7.7 mi558
ZIP 61830Cisco7.9 mi510
ZIP 61855Milmine8.3 mi24
ZIP 61813Bement8.3 mi2,043

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →