As of the 2010 United States census, there were 135,394 people, 54,146 households, and 37,163 families living in the county. The population density was . There were 57,516 housing units at an average density of . The racial makeup of the county was 96.2% white, 1.0% black or African American, 0.7% Asian, 0.3% American Indian, 0.5% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 1.9% of the population. In terms of ancestry, 35.6% were German, 15.6% were American, 14.4% were Irish, and 12.0% were English.
As of the 2010 United States census there were 135394 people 54146 households and 37163 families living in the county The population density was  There were 57516 housing units at an average density of  The racial makeup of the county was 962% white 10% black or African American 07% Asian 03% American Indian 05% from other races and 13% from two or more races Those of Hispanic or Latino origin made up 19% of the population In terms of ancestry 356% were German 156% were American 144% were Irish and 120% were English