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.

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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 62543 Latham Logan County 217, 447
IL 62544 Macon Macon County 217, 447
IL 62545 Mechanicsburg Sangamon County 217, 447
IL 62546 Morrisonville Christian County 217, 447
IL 62547 Mount Auburn Christian County 217, 447
IL 62548 Mount Pulaski Logan County 217, 447
IL 62549 Mt Zion Macon County 217, 447
IL 62550 Moweaqua Shelby County 217, 447
IL 62551 Niantic Macon County 217, 447
IL 62553 Oconee Shelby County 217, 447, 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.