Washington County is a former county of South Dakota, existing from 1883 to 1943. The county was mostly within the boundaries of the Pine Ridge Indian Reservation. On July 1, 1943, Washington County was divided and then merged into Jackson County, Pennington County, and Shannon County in 1943 because of financial troubles in South Dakota. For several years prior to its dissolution, Washington County was unorganized and was administered by Pennington County. Part of Washington County had previously been partitioned into the newly created

Bennett County Bennett County is a County (United States), county in the U.S. state of South Dakota. As of the 2020 United States census, 2020 census, the population was 3,381. Its county seat is Martin, South Dakota, Martin. The county lies completely within ...

in 1909.

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References

{{coord, 44.588, -97.555, type:adm3rd_globe:earth_region:US-SD, display=title Former counties of South Dakota Former populated places in South Dakota 1883 establishments in Dakota Territory 1943 disestablishments in South Dakota Oglala Lakota County, South Dakota Pennington County, South Dakota Jackson County, South Dakota Populated places established in 1883