| 1826 | Library in the court house attached to the Farmer's Society (Mill's Statistics, 1826) |
| 1832 | "Handsome" Library attached to the District Farmer's Society (Lockwood's Geography) |
| 1953 | Barnwell County Library officially opened |
| 1954 | Bookmobile service initiated Branch libraries opened in Blackville and Williston |
| 1958 | Joined Aiken and Edgefield in three county regional library service program |
| 1961 | SC ACTS No. 478 Act to levy taxes and for board to enter into contracts |