The city of Byrdstown is positioned between two man made lakes; Dale Hollow and Lake Cumberland. The area is known as "Twin Lakes" and Byrdstown is noted as "The Gateway To Dale Hollow Lake". Every year thousands of people vacation at the many resorts situated along the lakes.
As of the census of 2000, there were 4,945 people, 2,091 households, and 1,461 families residing in the county. The population density was 30 people per square mile (12/km²). There were 2,956 housing units at an average density of 18 per square mile (7/km²). The racial makeup of the county was 99.15% White, 0.10% Black or African American, 0.16% Native American, 0.04% Asian, 0.10% from other races, and 0.44% from two or more races. 0.83% of the population were Hispanic or Latino of any race.
There were 2,091 households out of which 27.40% had children under the age of 18 living with them, 58.30% were married couples living together, 7.80% had a female householder with no husband present, and 30.10% were non-families. 27.20% of all households were made up of individuals and 12.90% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.83.
In the county, the population was spread out with 21.40% under the age of 18, 8.60% from 18 to 24, 24.70% from 25 to 44, 27.70% from 45 to 64, and 17.80% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 96.80 males. For every 100 females age 18 and over, there were 94.20 males.
The median income for a household in the county was $24,673, and the median income for a family was $31,355. Males had a median income of $22,367 versus $17,173 for females. The per capita income for the county was $14,681. About 12.00% of families and 15.60% of the population were below the poverty line, including 19.40% of those under age 18 and 20.00% of those age 65 or over.