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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Iowa ZIP Codes

Complete postal directory, details, and geographic map for the State of Iowa.

State ZIP Code City County Area Codes
IA 52149 Highlandville Winneshiek County 563
IA 52151 Lansing Allamakee County 563, 608
IA 52154 Lawler Chickasaw County 563, 641
IA 52155 Lime Springs Howard County 507, 563, 641
IA 52156 Luana Clayton County 563
IA 52157 Mc Gregor Clayton County 563, 608
IA 52158 Marquette Clayton County 563
IA 52159 Monona Clayton County 563
IA 52160 New Albin Allamakee County 507, 563
IA 52161 Ossian Winneshiek County 563
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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.