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| 1813 | Bersheba Circulating Library Society |
| 1816 | Indian Land Library |
| 1817 | Bethel Circulating Library |
| 1884 | Rodk Hill Lirary Association established |
| 1900 | Rock Hill Library Association ceased operation |
| 1904 | Castalian Literary Club called for reorganization |
| 1910 | New Rock Hill Library Association (Women's Clubs) founded from memberships |
| 1915 | York County Library began |
| 1916 | Fire |
| 1923 | One mil of school tax for library |
| 1932 | Rock Hill Library opened (1905 post office moved) |
| 1933-1968 | Palmetto Branch (Black) |
| 1934 | Tax increased to two mills |
| 1937 | WPA Travelling Library |
| 1938 | WPA Travelling Library officially became York County Library |
| 1944 | York Township Library Statue, Kings Mountain Township Library - now Clover |
| 1956-1957 | Renovation |
| 1960 | Fort Mill founded |
| 1966 | York County Library System founded |
| 1968 | Permanent building for York County Library |
| 1972 | New building for Fort Mill Public Library |
| 1979 | Clarification of "Home Rule Legislation" - County library funded by County Council |
| 1982 | County building dedicated |
| 1999 | New Fort Mill Library building opened |