The county is the least-populated and least-densely populated of all of Florida's counties, although in the 2000 Census it had only one less person than the second least-populated county, Lafayette. The Apalachicola National Forest occupies half the county. Liberty County is only one of five dry counties in Florida.
There were 2,222 households out of which 34.20% had children under the age of 18 living with them, 51.80% were married couples living together, 13.20% had a female householder with no husband present, and 30.10% were non-families. 25.90% of all households were made up of individuals and 10.60% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.00.
In the county the population was spread out with 21.80% under the age of 18, 9.40% from 18 to 24, 37.70% from 25 to 44, 21.00% from 45 to 64, and 10.20% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 144.90 males. For every 100 females age 18 and over, there were 159.50 males.
The median income for a household in the county was $28,840, and the median income for a family was $34,244. Males had a median income of $22,078 versus $22,661 for females. The per capita income for the county was $17,225. About 16.80% of families and 19.90% of the population were below the poverty line, including 24.30% of those under age 18 and 24.30% of those age 65 or over.