Roswell is a CDP in Miner County, South Dakota, United States. The population was 8 at the 2020 census. It disincorporated as a town in …Roswell is a CDP in Miner County, South Dakota, United States. The population was 8 at the 2020 census. It disincorporated as a town in 2012. Roswell was laid out in 1883, and named in honor of Roswell Miller, a railroad official.