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 62354 Nauvoo Hancock County 217, 319, 447
IL 62355 Nebo Pike County 217, 447, 573, 618
IL 62356 New Canton Pike County 217, 447, 573
IL 62357 New Salem Pike County 217, 447
IL 62358 Niota Hancock County 217, 319, 447
IL 62359 Paloma Adams County 217, 447
IL 62360 Payson Adams County 217, 447
IL 62361 Pearl Pike County 217, 447, 618
IL 62362 Perry Pike County 217, 447
IL 62363 Pittsfield Pike 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.