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 | Official name: State of South Dakota South Dakota postal code abbreviation: SD South Dakota prefix phone numbers: 605 You may also be interested in the answers to the following questions: Total area: 199 905 km2 ✅ What is the largest city by population in South Dakota?- Largest South Dakota cities by population: Sioux Falls ✅ What is the capital of South Dakota?- State capital of South Dakota: Pierre ✅ What is the population of South Dakota?- South Dakota state population 2025: 824 082 |