Edmunds County is a county in the U.S. state of South Dakota. At the 2020 census, the population was 3,986. Its county seat is Ipswich. The county was established in 1873 and organized in 1883. It is named for Newton Edmunds, the second Governor of Dakota Territory.

The Aberdeen Micropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of two counties in South Dakota, anchored by the city of Aberdeen. As of the 2020 census, the μSA had a population of 42,287.