List of counties in South Dakota

Counties of South Dakota
Aur Beadle Bennett Bon Brook Brown Brule Buff Butte Camp Chas Mix Clark Cla Cod Corson Custer Dav Day Deu Dewey Doug Edmunds Fall River Faulk Grant Greg Haakon Ham Hand Ha Harding Hughes Hutch Hy Jackson Jer Jones Kings Lak Law Lin Lyman Marsh McC McPher Meade Mellette Miner Minne Moo Oglala Pennington Perkins Potter Robts San Spink Stanley Sully Todd Tripp Turn Un Wal Yank Ziebach
Location	State of South Dakota
Number	66
Populations	1,006 (Jones) – 169,468 (Minnehaha)
Areas	412 square miles (1,070 km2) (Clay) – 3,471 square miles (8,990 km2) (Meade)
Government	County government
Subdivisions	cities, towns, townships, unincorporated territories, unorganized territories, census designated place

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. It is also one of five counties in South Dakota which is entirely within an Indian reservation. (The other four counties are Corson, Dewey, Oglala Lakota, and Ziebach.)

South Dakota's postal abbreviation is SD and its FIPS state code is 46.

Darker colors indicate heavier density.