As of the census of 2000, there were 40,123 people, 16,013 households, and 11,513 families residing in the county. The population density was 99 people per square mile (38/km²). There were 17,792 housing units at an average density of 44 per square mile (17/km²). The racial makeup of the county was 96.88% White, 1.78% Black or African American, 0.16% Native American, 0.30% Asian, 0.01% Pacific Islander, 0.26% from other races, and 0.61% from two or more races. 0.73% of the population were Hispanic or Latino of any race.
There were 16,013 households out of which 31.00% had children under the age of 18 living with them, 56.20% were married couples living together, 12.00% had a female householder with no husband present, and 28.10% were non-families. 25.50% of all households were made up of individuals and 11.20% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.91.
In the county, the population was spread out with 23.00% under the age of 18, 10.20% from 18 to 24, 28.00% from 25 to 44, 24.80% from 45 to 64, and 13.90% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 95.00 males. For every 100 females age 18 and over, there were 91.60 males.
The median income for a household in the county was $26,149, and the median income for a family was $32,898. Males had a median income of $28,983 versus $21,029 for females. The per capita income for the county was $14,271. About 16.10% of families and 20.00% of the population were below the poverty line, including 27.30% of those under age 18 and 12.30% of those age 65 or over.