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

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	57440	Frankfort	Spink County	`605`
SD	57441	Frederick	Brown County	`605, 701`
SD	57442	Gettysburg	Potter County	`605`
SD	57445	Groton	Brown County	`605`
SD	57446	Hecla	Brown County	`605, 701`
SD	57448	Hosmer	Edmunds County	`605`
SD	57449	Houghton	Brown County	`605`
SD	57450	Hoven	Potter County	`605`
SD	57451	Ipswich	Edmunds County	`605`
SD	57452	Java	Walworth 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.