I have seen a handful of "autograph books" - lists of fellow Confederate prisoners held at Johnson's Island, Ohio. I have just examined one at the Library of Virginia in Richmond done by Wesley Makely. Makely writes the usual information, which is simply a name, regiment, residence, and where and when captured. But he has also compiled some statistics, of which I copied two here for general interest:

A List of Prisoners on Johnson's Is., February 1st 1864
Major General - 1
Brigadier Generals - 5
Colonels - 51
Lieutenant Colonels - 44
Majors - 58
Captains - 623
Lieutenants - 1712
Chaplains - 2
Privates - 45
Citizens - 72
Negro - 4
Total - 2617

[MGen/BGen/Col/LCol/Maj/Capt/Lt/Adjutant]
Alabama 0/0/5/4/11/66/184/0
Arkansas 0/1/7/7/9/83/165/6
Florida 0/0/3/0/2/10/37/0
Georgia 0/0/3/2/4/32/120/3
Kentucky 0/0/4/2/4/39/92/0
Louisiana 0/0/2/3/2/42/125/4
Missis. 0/0/4/4/4/52/174/2
Missouri 0/1/1/0/1/22/60/0
Maryland 1/1/0/1/1/2/12/0
NCarolina 0/0/7/6/7/62/246/4
SCarolina 0/0/0/0/1/12/36/0
Tennessee 0/1/7/6/7/68/204/5
Texas 0/0/1/1/1/14/29/1
Virginia 0/1/6/4/5/65/172/3