Note: Every ZIP Code has a single ACTUAL City Name assigned by the US Postal Service (USPS).
See the specific ZIP Code for acceptable Alternate City Names and spelling variations.
ZIP Codes in Winnebago County Address Data
Businesses Addresses: 10,126
PO Box Addresses: 3,421
Residential Addresses: 139,609
Multi-Family Addresses: 11,734
Single Family Addresses: 126,822
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Map of Winnebago County, IL ZIP Codes With Actual (Default) City Names