 Approximately 70 @.@ 3 % of the population ( over five years old ) spoke only English at home . An additional 23 @.@ 5 % of the population spoke Spanish at home . In terms of ancestry , 31 @.@ 2 % were Mexican , 14 @.@ 6 % of the population were of German ancestry , 9 @.@ 7 % were of Irish ancestry , 8 @.@ 9 % were of English ancestry , and 4 @.@ 0 % were of Italian ancestry . 
