Tourism is increasing in the county, especially the popularity of elk viewing. Knott County and its surrounding counties are home to 5,700 free ranging elk, the largest elk herd east of the Mississippi River.
Knott County tourism has expanded in recent years, with the opening of an ATV Training Center dedicated to the safety of ATV usage amongst riders and the Knott County Sportsplex, a sports complex dedicated to bringing athletic opportunities to people of all ages, through indoor basketball courts, outside baseball fields, a soccer field, and a fitness center.
As of the census of 2000, there were 17,649 people, 6,717 households, and 4,990 families residing in the county. The population density was 50 per square mile (19 /km). There were 7,579 housing units at an average density of 22 per square mile (8.5 /km). The racial makeup of the county was 98.27% White, 0.73% Black or African American, 0.11% Native American, 0.15% Asian, 0.01% Pacific Islander, 0.12% from other races, and 0.60% from two or more races. 0.63% of the population were Hispanic or Latino of any race.
There were 6,717 households out of which 34.40% had children under the age of 18 living with them, 57.60% were married couples living together, 12.60% had a female householder with no husband present, and 25.70% were non-families. 23.60% of all households were made up of individuals and 9.30% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.00.
In the county the population was spread out with 24.50% under the age of 18, 10.80% from 18 to 24, 29.00% from 25 to 44, 24.30% from 45 to 64, and 11.40% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 97.30 males. For every 100 females age 18 and over, there were 94.10 males.
The median income for a household in the county was $20,373, and the median income for a family was $24,930. Males had a median income of $29,471 versus $21,240 for females. The per capita income for the county was $11,297. About 26.20% of families and 31.10% of the population were below the poverty line, including 39.80% of those under age 18 and 23.10% of those age 65 or over.