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.

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State directory

South Dakota ZIP Codes

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

State ZIP Code City County Area Codes
SD 57533 Gregory Gregory County 402, 531, 605
SD 57534 Hamill Tripp County 605
SD 57536 Harrold Hughes County 605
SD 57537 Hayes Stanley County 605
SD 57538 Herrick Gregory County 402, 531, 605
SD 57540 Holabird Hyde County 605
SD 57541 Ideal Tripp County 605
SD 57543 Kadoka Jackson County 605
SD 57544 Kennebec Lyman County 605
SD 57547 Long Valley Jackson County 605
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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.