1 % ▁( 1 3 , 4 2 5 ) ▁of ▁the ▁population ▁aged ▁ 5 ▁or ▁older ▁spoke ▁German , ▁ 1 . 5 2 % ▁( 1 0 , 6 7 5 ) ▁spoke ▁Dak ota , ▁and ▁ 1 . 4 3 % ▁( 1 0 , 0 5 5 ) ▁spoke ▁Spanish . ▁Another ▁ 0 . 1 8 % ▁spoke ▁French , ▁ 0 . 1 2 % ▁spoke ▁Norwegian , ▁and ▁ 0 . 0 9 % ▁spoke ▁Czech . ▁ ▁From ▁ 2 0 0 0 ▁to ▁ 2 0 1 0 , ▁Spanish ▁replaced ▁German ▁as ▁the ▁most ▁common ▁non - English ▁language ▁spoken ▁in ▁South ▁Dak ota . ▁Dak ota ▁also ▁passed ▁German , ▁making ▁German ▁the ▁third - most ▁common ▁non - English ▁language ▁in ▁the ▁state . ▁The ▁percentage ▁of ▁non - English ▁languages ▁spoken ▁rose ▁from ▁ 6 . 3 5 % ▁in ▁ 2 0 0 0 ▁to ▁ 6 . 5 6 % ▁in ▁ 2 0 1 0 . ▁ ▁Religion ▁The ▁majority ▁of ▁South ▁Dak ot ans ▁who ▁claim ▁a ▁religious ▁affili ation ▁are ▁Christians . ▁As ▁of ▁ 2 0 1 0 , ▁Main line ▁Protest ant ism ▁was ▁the ▁most ▁popular ▁religious ▁tradition ▁in ▁South ▁Dak ota , ▁with ▁ 1 9 6 , 0 0 1 ▁ad her ents . ▁Catholic ism ▁was ▁second ▁with ▁ 1 4 8 , 8 8 3 ▁ad her ents , ▁and ▁Evangel ical ▁Protest ant ism ▁was