From the Guide to 2010 Census State and Local Geography — South Dakota, History:
The United States acquired almost all of the area of South Dakota from France in 1803 as part of the Louisiana Purchase. A small portion in the northeast part of the present-day state was added by a convention signed with Great Britain in 1818. Dakota Territory was organized on March 2, 1861, from unorganized area formerly within Minnesota Territory and part of Nebraska Territory. Dakota Territory included all of the present-day states of North Dakota and South Dakota, most of Montana, the northern half of Wyoming, and a small part of Nebraska. The territory was reduced in 1863 with the organization of Idaho Territory, enlarged in 1864 with the addition of most of the remainder of present-day Wyoming, and again reduced with the organization of Wyoming Territory in 1868. In 1882, the state of Nebraska acquired an area north of the Keya Paha River and Niobrara River. South Dakota was admitted to the Union simultaneously with North Dakota on November 2, 1889, as the 39th and 40th states, with generally the same boundary as the present state.
Data for the legally established state of South Dakota are available beginning with the 1890 census.
From QuickFacts: statistics for all states and counties, and for cities and towns with a population of 5,000 or more.
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Sources: 2018 Population and Housing Unit Estimates; 2013-2017 American Community Survey, 5-Year Estimates; 2010 Census. Community Facts — Find popular facts (population, income, etc.) and frequently requested data about your community.
Source: 2018 Population Estimates.
Source: 2018 American Community Survey, 1-Year Estimates.
Note: After you create an account, select options for State Export Data (Origin of Movement) or State Import Data (State of Destination) by HS or NAICS. Select State (South Dakota) and Measures, Commodity, Country and/or Time for data. For more information, see Quick Start Guide.
Sources: 2014 Population Estimates and 2014 American Community Survey, 1-Year Estimates.
Sources: 2009-2013 American Community Survey, 5-Year Estimates, 2012 Survey of Business Owners and other federal data.
Source: 2012 Economic Census. The Census Bureau will release 2017 Economic Census statistics from September 2019 through 2021.