▁legisl ature , ▁en comp ass ing ▁the ▁western ▁part ▁of ▁the ▁Town ▁of ▁Lake ); ▁and ▁on ▁December ▁ 2 0 , ▁ 1 8 3 9 , ▁the ▁south ▁portion ▁of ▁the ▁Town ▁of ▁K inn ik enn ick ▁was ▁split ▁off ▁to ▁form ▁the ▁town ▁of ▁Franklin . ▁As ▁of ▁the ▁ 1 8 4 0 ▁census , ▁the ▁population ▁of ▁the ▁Town ▁of ▁K inn ik enn ick ▁or ▁K inn ik inn ick ▁was ▁ 4 0 4 . ▁ ▁On ▁February ▁ 1 9 , ▁ 1 8 4 1 , ▁the ▁name ▁of ▁the ▁town ▁was ▁changed ▁to ▁Green field , ▁taking ▁its ▁name ▁from ▁the ▁name ▁of ▁the ▁Post ▁Office ▁in ▁the ▁Town ▁of ▁K inn ick inn ic . ▁Green field ▁was ▁the ▁final ▁municipality ▁in ▁Mil w au kee ▁County ▁to ▁incorpor ate , ▁and ▁was ▁the ▁final ▁municipality ▁to ▁leave ▁the ▁Town ▁form ▁of ▁government ▁in ▁ 1 9 5 7 . ▁This ▁was ▁done ▁to ▁prevent ▁total ▁an nex ation ▁by ▁the ▁City ▁of ▁Mil w au kee . ▁Before ▁ 1 9 5 7 , ▁Mil w au kee ▁slowly ▁n ib bled ▁away ▁at ▁Green field ' s ▁land . ▁ ▁Geography ▁Green field ▁is ▁located ▁at ▁ ▁( 4 2 . 9 6 3 0 3 4 , ▁- 8 7 . 9 9 5 9 4 3 ). ▁The ▁Root ▁River ▁flows ▁through ▁the ▁western ▁part ▁of ▁the ▁city . ▁ ▁According ▁to ▁the ▁United ▁States ▁Census