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 Saint Clair County Address Data
Businesses Addresses: 9,689
PO Box Addresses: 3,220
Residential Addresses: 141,705
Multi-Family Addresses: 6,690
Single Family Addresses: 134,780
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Map of Saint Clair County, IL ZIP Codes With Actual (Default) City Names