As of the census of 2000, there were 61,266 people, 22,079 households, and 16,183 families residing in the county. The population density was 86 people per square mile (33/km²). There were 25,900 housing units at an average density of 37 per square mile (14/km²).
The racial makeup of the county was 94.83% Caucasian, 2.17% African-American, 0.60% Native American, 0.26% Asian, 0.05% Pacific Islander, 0.64% from other races, and 1.46% from two or more races. 2.28% of the population were Hispanic or Latino of any race. 25.5% were of English ancestry, 22.5% were of German ancestry, 9.5% were of Irish ancestry, 6.0% were of Dutch descent, and 5.7% were of Danish ancestry.
According to the 2010 American Community Survey estimate. 96.4% spoke only English at home, while 2.1% spoke Spanish.
There were 22,079 households out of which 35.30% had children under the age of 18 living with them, 58.80% were married couples living together, 9.70% had a female householder with no husband present, and 26.70% were non-families. 21.90% of all households were made up of multiple individuals, and 9.20% had someone living alone who was 65 years of age or older. The average household size was 2.65, and the average family size was 3.07.
In the county, the population was spread out with 27.10% under the age of 18, 8.30% from 18 to 24, 30.20% from 25 to 44, 22.30% from 45 to 64, and 12.10% who were 65 years of age or older. The median age was 36 years.
For every 100 females, there were 105.50 males. For every 100 females age 18 and over, there were 106.00 males.
The median income for a household in the county was $37,218, and the median income for a family was $42,823. Males had a median income of $32,635 versus $23,645 for females. The per capita income for the county was $16,183. About 7.40% of families and 10.90% of the population were below the poverty line, including 14.00% of those under age 18 and 8.70% of those age 65 or over.