From Clara’s Journal and the Story of Two Pandemics, by Vickie Oddino (Dobson St., 2021), pp. 97-98:
When the Milwaukee [RR] was surveying its line through Brown County in 1880, conventional wisdom held that the line would be routed through Columbia, which was the county seat. Columbia’s town fathers, feeling that they were in a strong negotiating position, refused to provide the Milwaukee with land for a right of way and a depot free of charge. C. H. Prior, then chief surveyor of the Milwaukee, resurveyed the main line to bypass Columbia and then platted a rival town (on a tract of land owned by his wife) some 12 miles from Columbia. This site became the City of Aberdeen, which was designated as a railroad division point, became the junction for several Milwaukee lines, and eventually became the third largest city in the state. Columbia stagnated and lost the county seat to Aberdeen several years later.
One of Aberdeen’s claims to fame is that L. Frank Baum, the author of The Wizard of Oz, lived there from 1888-1891 with his wife and two sons (the couple would have two more sons while in South Dakota). While there, he opened a gift shop, Baum’s Bazaar, and when it closed after two years, he purchased the weekly newspaper the Dakota Pioneer and changed its name to Saturday Pioneer. Believe it or not, this paper was one of Aberdeen’s seven weekly papers and two dailies at the time.