U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
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State directory

Illinois ZIP Codes

Complete postal directory, details, and geographic map for the State of Illinois.

State ZIP Code City County Area Codes
IL 62264 New Athens St. Clair County 618
IL 62265 New Baden Clinton County 618
IL 62266 New Memphis Clinton County 618
IL 62268 Oakdale Washington County 618
IL 62269 O Fallon St. Clair County 618
IL 62271 Okawville Washington County 618
IL 62272 Percy Randolph County 618
IL 62273 Pierron Bond County 618
IL 62274 Pinckneyville Perry County 618
IL 62275 Pocahontas Bond County 618
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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.