Big Stone County Courthouse, 20 2nd St. SE, Ortonville, Minnesota, USA. Viewed from the southwest atop a stepladder, corrected for tilt distortion. – McGhiever, CC BY-SA 3.0 – Wikimedia Commons Big Stone County is located in Minnesota. About 5,166 people live here (as of 2020). Between 2010 and 2020, the population declined from 5,269 to 5,166. The area covers about 1,367.0 square kilometers. The region is divided into 8 Municipalities. The region was founded in 1862. The name originates from Big Stone Lake (freshwater lake and reservoir on the border between western…) Big Stone County is county in Minnesota, United States. More information at bigstonecounty.gov.