Richland is a small unincorporated community and census-designated place (CDP) in Union County, South Dakota, United States. The population was 97 at the 2020 census.
In 1861, the community was founded by and named after Milton M. Rich of Chicago. Mr. Rich was reported to have dreamed of building a community below the bluffs. However, it was also reported that Mr. Rich disagreed with railroad officials on how to divide the site of the town. The dispute was never resolved; and as a result, the railroad was deflected to Sioux City, Iowa after reaching Le Mars, Iowa.