Adopted in 1966, revised 1992 (prior existing flags remain official). South Dakota was admitted as the 40th state in 1889. The flag emblem for South Dakota contains the black & white version of the seal, surrounded by the gold serrated sun and lettering as described below. The state flag or banner shall consist of a sky-blue one and two-thirds as long as it is wide. Centered on such field shall be the great seal of South Dakota made in conformity with the terms of the Constitution, which shall be four-ninths the width of the flag in diameter.