Shelby County was historically a prohibition or completely dry county, but the city of Shelbyville is now wet (i.e., allows retail alcohol sales), and the county has voted to allow restaurants outside Shelbyville to sell alcoholic beverages by the drink if they seat at least 100 patrons and derive at least 70% of their total sales from food. Today, Shelby County is officially classified by the Kentucky Office of Alcoholic Beverage Control as a moist county.
Shelby County's motto is "Good Land, Good Living, Good People".
As of the census of 2000, there were 33,337 people, 12,104 households, and 9,126 families residing in the county. The population density was 87 per square mile (34 /km). There were 12,857 housing units at an average density of 34 per square mile (13 /km). The racial makeup of the county was 86.61% White, 8.83% Black or African American, 0.30% Native American, 0.40% Asian, 0.12% Pacific Islander, 2.39% from other races, and 1.34% from two or more races. 4.51% of the population were Hispanic or Latino of any race.
There were 12,104 households out of which 34.70% had children under the age of 18 living with them, 61.00% were married couples living together, 10.60% had a female householder with no husband present, and 24.60% were non-families. 20.20% of all households were made up of individuals and 8.00% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 3.00.
The age distribution was 25.20% under the age of 18, 8.70% from 18 to 24, 31.40% from 25 to 44, 24.00% from 45 to 64, and 10.80% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 94.90 males. For every 100 females age 18 and over, there were 91.30 males.
The median income for a household in the county was $45,534, and the median income for a family was $52,764. Males had a median income of $35,484 versus $25,492 for females. The per capita income for the county was $20,195. About 6.50% of families and 9.90% of the population were below the poverty line, including 11.70% of those under age 18 and 12.30% of those age 65 or over.