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
All states and U.S. territories
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State directory

Iowa ZIP Codes

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

State ZIP Code City County Area Codes
IA 50574 Pocahontas Pocahontas County 712
IA 50575 Pomeroy Calhoun County 712
IA 50576 Rembrandt Buena Vista County 712
IA 50577 Renwick Humboldt County 515, 641
IA 50578 Ringsted Emmet County 515, 712
IA 50579 Rockwell City Calhoun County 515, 712
IA 50581 Rolfe Pocahontas County 515, 712
IA 50582 Rutland Humboldt County 515
IA 50583 Sac City Sac County 712
IA 50585 Sioux Rapids Buena Vista County 712
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Geographic Map of Iowa

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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.