I declare my candiacy for the Senate, tho whether it will be Distruct 3 or 4 will depend upon the results of redistricting.
South Carolina is in District 4 for all the 3 maps under consideration.
Unless the rule for Distrct numbering has been changed then under map 5, SC is in District 3 as that district will have the third fewest states. The blue midwest/great plains district has 13 states in that map, as does the orange western map, while the green southeast district has only 11.
(For similar reasons of fluctuating district numbers, Pennsylvannia is the only state guarenteed to be in District 1.)