Searchable database for Union prisoners of War imprisoned at Andersonville Prison, also known as Camp Sumter. Andersonville is the most well-known and notorious of all the Civil War prisons, north and south. From February 1864 until May 1865, over 42,000 men were interned there. The peak population in 1864 was nearly 33,000 men. More than 12,000 prisoners died at Andersonville and are buried in the National Cemetery on the grounds.