Botetourt County is part of the Roanoke Metropolitan Statistical Area and located in the Roanoke Region of Virginia.
As of the census of 2000, there were 30,496 people, 11,700 households, and 9,114 families residing in the county. The population density was 56 people per square mile (22/km²). There were 12,571 housing units at an average density of 23 per square mile (9/km²). The racial makeup of the county was 94.91% White, 3.52% Black or African American, 0.22% Native American, 0.47% Asian, 0.19% from other races, and 0.69% from two or more races. 0.59% of the population were Hispanic or Latino of any race.
There were 11,700 households out of which 32.40% had children under the age of 18 living with them, 67.80% were married couples living together, 7.00% had a female householder with no husband present, and 22.10% were non-families. 19.20% of all households were made up of individuals and 7.60% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 2.92.
In the county, the population was spread out with 23.40% under the age of 18, 5.80% from 18 to 24, 28.90% from 25 to 44, 28.80% from 45 to 64, and 13.20% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 99.70 males. For every 100 females age 18 and over, there were 98.40 males.
The median income for a household in the county was $48,731, and the median income for a family was $55,125. Males had a median income of $37,182 versus $25,537 for females. The per capita income for the county was $22,218. About 3.60% of families and 5.20% of the population were below the poverty line, including 5.40% of those under age 18 and 6.50% of those age 65 or over.