These tables are historical listings of state senators who served in the South Dakota Senate from statehood in 1889 until the present.
Senators were elected from single-member districts, with five counties each electing two at-large senators.
Three counties each elected two at-large senators.
35 senators elected from 35 single-member districts.
From 1967 to 1973, there were only 29 districts, with three counties each electing more than one at-large member.