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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Illinois ZIP Codes

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

State ZIP Code City County Area Codes
IL 62963 Mound City Pulaski County 270, 364, 618
IL 62964 Mounds Pulaski County 618
IL 62965 Muddy Saline County 618
IL 62966 Murphysboro Jackson County 618
IL 62967 New Burnside Johnson County 618
IL 62969 Olive Branch Alexander County 618
IL 62970 Olmsted Pulaski County 270, 364, 618
IL 62971 Oraville Jackson County 618
IL 62972 Ozark Johnson County 618
IL 62973 Perks Pulaski 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.