Answer:
As of the 2010 US Census, the following are the largest cities in South Dakota by population:
1) Sioux Falls (153,888)
2) Rapid City (67,956)
3) Aberdeen (26,091)
4) Brookings (22,056)
5) Watertown (21,482)
6) Mitchell (15,254)
7) Yankton (14,454)
8) Pierre (13,646) (state capital)
9) Huron (12,592)
10) Vermillion (10,571).