St. Onge is located in northeastern Lawrence County, on South Dakota Highway 34, which goes northwest to Belle Fourche and southeast to Interstate 90 at Whitewood. Spearfish, the largest community in Lawrence County, is 12 miles southwest of St. Onge.
The town of St. Onge was founded in 1881 and named after Henry P. Saintonge, a pioneering settler. In 2020 the population of St. Onge was around 20 residents. There are still a few historic structures standing in St. Onge.
Home to St. Onge Livestock and The St. Onge bar, this quaint little town makes for a nice stop on your way to Sturgis or Belle Fourche!