List of counties in South Dakota

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There are 66 counties in the U.S. state of South Dakota with FIPS codes. Todd County and Oglala Lakota County are the only counties in South Dakota which do not have their own county seats. Hot Springs in Fall River County serves as the administrative center for Oglala Lakota County. Winner in Tripp County serves as the administrative center for Todd County. These are two of six counties in South Dakota which are entirely within an Indian reservation. (The other four counties are Bennett, Corson, Dewey, and Ziebach.) South Dakota's postal abbreviation is SD and its FIPS state code is 46.

Table of counties

Former names

Former counties

Population density map

Darker colors indicate heavier density.

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