In the town, the population was spread out, with 29.2% under the age of 18, 8.9% from 18 to 24, 26.6% from 25 to 44, 23.0% from 45 to 64, and 12.3% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 88.0 males. For every 100 females age 18 and over, there were 80.1 males. The median income for a household in the town was $21,316, and the median income for a family was $28,537. Males had a median income of $25,150 versus $20,742 for females. The per capita income for the town was $11,881. About 27.0% of families and 29.9% of the population were below the poverty line, including 40.6% of those under age 18 and 28.5% of those age 65 or over. Education facilities in Blackville include Macedonia Elementary School, Blackville-Hilda Junior High School, Blackville-Hilda High School, Jefferson Davis Academy, Calvary Fellowship Mennonite, Bamberg/Barnwell County Adult Education, and Barnwell Christian School. Blackville has a public library, a branch of the ABBE Regional Library System. God's Acre Healing Springs is a small patch of land whose legal owner is "God Almighty". The land includes a natural spring whose water local tradition holds has healing powers.