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 61261 Lyndon Whiteside County 309, 779, 815
IL 61262 Lynn Center Henry County 309
IL 61263 Matherville Mercer County 309
IL 61264 Milan Rock Island County 309, 563
IL 61265 Moline Rock Island County 309, 563
IL 61266 Moline Rock Island County 309
IL 61270 Morrison Whiteside County 309, 779, 815
IL 61272 New Boston Mercer County 309, 319
IL 61273 Orion Henry County 309
IL 61274 Osco Henry County 309
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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.