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Zip Code 61081 — Sterling, IL

ZIP Code 61081 is associated with Sterling, IL, in Whiteside County. The listed population estimate is 20,844; estimated density is 64.7 people per square mile. Among records with population estimates, it ranks #1 of 12 in Whiteside County and #229 of 1,390 in IL.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (41.844250, -89.736130)

Data MetricLocal Statistic
Postal / Zip Code61081
Primary CitySterling
State / ProvinceIL
CountyWhiteside
Total Population20,844
Population Density64.7 people/sq mi
TimezoneAmerica/Chicago

How 61081 Compares

MetricZIP 61081Whiteside County recordsIL records
Population estimate20,84456,250 (sum)12,694,745 (sum)
Population Density64.7 /sq mi----
County population rank#1 of 12----
State population rank#229 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 61037Galt4.1 mi145
ZIP 61071Rock Falls8.4 mi13,581
ZIP 61051Milledgeville9.7 mi1,469
ZIP 61091Woosung10.4 mi248
ZIP 61270Morrison11.9 mi6,912

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 →