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Adams County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 2,200. The county seat is Hettinger. The county was created on April 17, 1907, and organized one week later. It was named for John Quincy Adams (1848–1919), a railroad official for the Milwaukee Road Railroad and distant relative of sixth U.S. President John Quincy Adams (1767–1848).
Spink County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 6,361. Its county seat is Redfield. The county was created in 1873, and was organized in 1879 within Dakota Territory.
Oglala Lakota County is a county in southwestern South Dakota, United States. As of the 2020 census, the population was 13,672. Oglala Lakota County does not have a functioning county seat; Hot Springs in neighboring Fall River County serves as its administrative center. The county was created as a part of the Dakota Territory in 1875, although it remains unorganized. Its largest community is Pine Ridge.
Roberts County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 10,280. Its county seat is Sisseton. The county was named either for S. G. Roberts of Fargo, North Dakota, or for Solomon Robar, an early local French fur trader. It was created on March 8, 1883, and fully organized by August 6 of that year. Its boundary was altered once, in 1885.
Perkins County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 2,835. Its county seat is Bison. The county was established in 1908 and organized in 1909. It was named for Sturgis, South Dakota, official Henry E. Perkins.
Mellette County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 1,918. Its county seat is White River. The county was created in 1909, and was organized in 1911. It was named for Arthur C. Mellette, the last Governor of the Dakota Territory and the first Governor of the state of South Dakota.
Lawrence County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 25,768. Its county seat is Deadwood.
Hand County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 3,145. Its county seat is Miller.
Haakon County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 1,872. Its county seat is Philip.
Custer County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 8,318. Its county seat is Custer. The county was created in 1875, and was organized in 1877.
Corson County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 3,902. Its county seat is McIntosh. The county was named for Dighton Corson, a native of Maine, who came to the Black Hills in 1876, and in 1877 began practicing law at Deadwood.
Buffalo County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 1,948. Its county seat is Gann Valley which, at 10 people, is the least populous county seat in the United States. The county was created in 1864, and was organized in 1871 as part of the Dakota Territory.
Brookings County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 34,375, making it the fifth-most populous county in South Dakota. Its county seat is Brookings. The county was created in 1862 and organized in 1871.
Williams County is located on the western border of the U.S. state of North Dakota, next to Montana. As of the 2020 census, the population was 40,950. making it the fifth-most populous county in North Dakota. Its county seat is Williston.
Towner County is a county in the U.S. state of North Dakota. As of the 2020 census, the population is 2,162. Its county seat is Cando. It is south of the Canada–US border with Manitoba.
Rolette County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 12,187. Its county seat is Rolla.
Richland County is a county in the far southeast corner of the U.S. state of North Dakota. As of the 2020 census, the population was 16,529. Its county seat is Wahpeton.
Dickey County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 4,999. Its county seat is Ellendale.
Dakota County is a county in the U.S. state of Nebraska. As of the 2020 United States Census, the population was 21,582. Its county seat is Dakota City.
