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 52568 Martinsburg Keokuk County 641
IA 52569 Melrose Monroe County 641
IA 52570 Milton Van Buren County 319, 641, 660
IA 52571 Moravia Appanoose County 641
IA 52572 Moulton Appanoose County 641, 660
IA 52573 Mount Sterling Van Buren County 319, 660
IA 52574 Mystic Appanoose County 641
IA 52576 Ollie Keokuk County 319, 641
IA 52577 Oskaloosa Mahaska County 641
IA 52580 Packwood Jefferson County 319, 641
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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.