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 62069 Mount Olive Macoupin County 217, 447, 618
IL 62070 Mozier Calhoun County 618
IL 62071 National Stock Yards St. Clair County 618
IL 62074 New Douglas Madison County 217, 447, 618
IL 62075 Nokomis Montgomery County 217, 447, 618
IL 62076 Ohlman Montgomery County 217, 447
IL 62077 Panama Montgomery County 217, 447
IL 62078 Patterson Greene County 217, 447
IL 62079 Piasa Macoupin County 618
IL 62080 Ramsey Fayette 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.