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U.S. ZIP Codes Database 2026

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LaSalle County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in LaSalle County.

County State ZIP Code City Area Codes
LaSalle County IL 60470 Ransom 779, 815
LaSalle County IL 60518 Earlville 779, 815
LaSalle County IL 60531 Leland 779, 815
LaSalle County IL 60537 Millington 779, 815
LaSalle County IL 60549 Serena 779, 815
LaSalle County IL 60551 Sheridan 779, 815
LaSalle County IL 60552 Somonauk 779, 815
LaSalle County IL 60557 Wedron 779, 815
LaSalle County IL 61301 La Salle 779, 815
LaSalle County IL 61316 Cedar Point 779, 815
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.