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Zip Code 61103 — Rockford, IL

61103 is a ZIP Code associated with Rockford, IL, located within Winnebago. 61103 ranks #5 out of 20 ZIP codes in Winnebago County by population (and #213 out of 1,396 in IL). The area supports an estimated population of 22,869 residents across Data Pending housing units, with a population density of 540.5 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (42.345300, -89.082710)

Data MetricLocal Statistic
Postal / Zip Code61103
Primary CityRockford
State / ProvinceIL
CountyWinnebago
Total Population22,869
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density540.5 people/sq mi
TimezoneAmerica/Chicago

How 61103 Compares

MetricZIP 61103Winnebago CountyIL State Average
Population22,869285,063 (Total)12,694,745 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density540.5 /sq mi----
County Pop Rank#5 of 20----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 61115Machesney Park3.0 mi22,364N/A
Zip 61101Rockford3.3 mi19,318N/A
Zip 61111Loves Park4.1 mi23,286N/A
Zip 61114Rockford5.4 mi15,325N/A
Zip 61107Rockford5.9 mi30,765N/A

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 →