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 62433 Hutsonville Crawford County 217, 447, 618, 812, 930
IL 62434 Ingraham Clay County 618
IL 62435 Janesville Coles County 217, 447
IL 62436 Jewett Cumberland County 217, 447, 618
IL 62438 Lakewood Shelby County 217, 447, 618
IL 62439 Lawrenceville Lawrence County 618, 812, 930
IL 62440 Lerna Coles County 217, 447
IL 62441 Marshall Clark County 217, 447, 812, 930
IL 62442 Martinsville Clark County 217, 447, 618
IL 62443 Mason Effingham 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.