There are 20 zip codes in Winnebago County, Illinois. The most populated is 61108, located in Rockford. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6110829,673Rockford
6110729,386Rockford
6110926,382Rockford
6110323,441Rockford
6111122,756Loves Park
6111522,542Machesney Park
6107320,567Roscoe
6110120,481Rockford
6110418,306Rockford
6110216,875Rockford
6111415,017Rockford
6107211,077Rockton
6108010,780South Beloit
610886,094Winnebago
610165,185Cherry Valley
610634,144Pecatonica
610242,524Durand
61079213Shirland
61077118Seward
61112113Rockford

Zip Codes in Winnebago County, Illinois by Population (2024)