As of the census of 2000, there were 49,927 people, 18,009 households, and 12,192 families residing in the county. The population density was 48 people per square mile (19/km²). There were 24,505 housing units at an average density of 24 per square mile (9/km²). The racial makeup of the county was 97.03% White, 0.72% Black or African American, 0.28% Native American, 0.72% Asian, 0.37% from other races, and 0.88% from two or more races. 0.91% of the population were Hispanic or Latino of any race. 22.3% were of German, 16.6% English, 13.8% Irish, 11.9% American and 7.0% Italian ancestry according to Census 2000. 96.5% spoke English and 1.3% Spanish as their first language.
There were 18,009 households out of which 31.50% had children under the age of 18 living with them, 54.20% were married couples living together, 9.00% had a female householder with no husband present, and 32.30% were non-families. 26.00% of all households were made up of individuals and 11.30% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.04.
In the county the population was spread out with 24.40% under the age of 18, 15.50% from 18 to 24, 23.90% from 25 to 44, 22.20% from 45 to 64, and 14.00% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 99.80 males. For every 100 females age 18 and over, there were 98.10 males.
The median income for a household in the county was $32,106, and the median income for a family was $38,580. Males had a median income of $30,401 versus $21,466 for females. The per capita income for the county was $14,975. About 10.50% of families and 15.50% of the population were below the poverty line, including 19.20% of those under age 18 and 7.50% of those age 65 or over.