The South Carolina Constitution of 1895 provided for each county to elect one senator for a four-year term.

After the U.S. Supreme Court ruled in 1964 for the case Reynolds v. Sims, the state Senate was reapportioned in 1966 as a temporary measure into 27 districts with 50 members for two-year terms.

In 1967, the state Senate was again reapportioned, this time into 20 districts with 46 members for four-year terms.

The annual session of the General Assembly convenes at the State Capitol Building in Columbia on the second Tuesday of January of each year.

[1] Except as noted, all senators were elected in November 2020 and terms began on January 12, 2021.