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 62615 Auburn Sangamon County 217, 447
IL 62617 Bath Mason County 217, 309, 447
IL 62618 Beardstown Cass County 217, 309, 447
IL 62621 Bluffs Scott County 217, 447
IL 62622 Bluff Springs Cass County 217, 447
IL 62624 Browning Schuyler County 217, 309, 447
IL 62625 Cantrall Sangamon County 217, 447
IL 62626 Carlinville Macoupin County 217, 447, 618
IL 62627 Chandlerville Cass County 217, 309, 447
IL 62628 Chapin Morgan 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.