How many prisoners were housed at Stalag 13, and how many barracks were on the compound?
It was never conclusively revealed on the show, but in those occasional glimpses where a map of the compound was shown (e.g., on the wall of Klink’s office), guestimates are that the camp contained approximately 100 buildings. If you go on the assumption that each barrack housed roughly 15 POWs (using Hogan’s barracks as the exemplar), and that not all the buildings shown were barracks (some included the rec hall, quarters for guards, etc.) then that would place about 1000 POWs in Stalag 13. In “The Kommandant Dies at Dawn,” Schultz mentions that the camp had 80 guards.