SIOUX FALLS, S.D. (KELO) – The total number of registered voters passed 609,000 as of Sept. 3, according to the South Dakota Secretary of State’s Office. After ending 2023 in December with 146,135 registered voters, the number of registered Democrats dropped to 143,914 in July. But the numbers are inching upward to 144,023 as of Sept. 3.