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 62662 Lowder Sangamon County 217
IL 62663 Manchester Scott County 217, 447
IL 62664 Mason City Mason County 217, 309, 447
IL 62665 Meredosia Morgan County 217, 447
IL 62666 Middletown Logan County 217, 447
IL 62667 Modesto Macoupin County 217, 447
IL 62668 Murrayville Morgan County 217, 447
IL 62670 New Berlin Sangamon County 217, 447
IL 62671 New Holland Logan County 217, 447
IL 62672 Nilwood Macoupin County 217, 447
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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.