Delmont is a city in southeastern Douglas County, South Dakota, United States. The population was 153 at the 2020 census. Delmont was lai…Delmont is a city in southeastern Douglas County, South Dakota, United States. The population was 153 at the 2020 census. Delmont was laid out in 1886. The Onion House, named for his onion shaped metallic dome and located in Delmont, is listed on the list of National Register of Historic Places since 1987. Also included on the same historic marker is Bluebird Locker, a local business in Delmont known for its “Delmont Sausage” but also serves as a butchery for other types of meats.
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