1 . 4 % ▁of ▁the ▁population . ▁In ▁terms ▁of ▁ancest ry , ▁ 6 8 . 5 % ▁were ▁German , ▁ 1 4 . 1 % ▁were ▁Norwegian , ▁ 1 2 . 6 % ▁were ▁Dutch , ▁ 1 1 . 4 % ▁were ▁Russian , ▁ 7 . 8 % ▁were ▁Irish , ▁and ▁ 2 . 7 % ▁were ▁American . ▁ ▁Of ▁the ▁ 6 9 4 ▁households , ▁ 2 1 . 6 % ▁had ▁children ▁under ▁the ▁age ▁of ▁ 1 8 ▁living ▁with ▁them , ▁ 5 5 . 6 % ▁were ▁married ▁cou ples ▁living ▁together , ▁ 3 . 0 % ▁had ▁a ▁female ▁house holder ▁with ▁no ▁husband ▁present , ▁ 3 9 . 0 % ▁were ▁non - famil ies , ▁and ▁ 3 5 . 6 % ▁of ▁all ▁households ▁were ▁made ▁up ▁of ▁individuals . ▁The ▁average ▁household ▁size ▁was ▁ 2 . 1 1 ▁and ▁the ▁average ▁family ▁size ▁was ▁ 2 . 7 0 . ▁The ▁median ▁age ▁was ▁ 5 0 . 1 ▁years . ▁ ▁The ▁median ▁income ▁for ▁a ▁household ▁in ▁the ▁county ▁was ▁$ 4 2 , 8 3 3 ▁and ▁the ▁median ▁income ▁for ▁a ▁family ▁was ▁$ 4 8 , 8 6 4 . ▁M ales ▁had ▁a ▁median ▁income ▁of ▁$ 4 1 , 5 6 3 ▁versus ▁$ 3 0 , 7 0 5 ▁for ▁females . ▁The ▁per ▁cap ita ▁income ▁for ▁the ▁county ▁was ▁$