Based as I am in the UK, my information on the matter is somewhat out-of-date, having been obtained prior to ISIS closing to the public.
As such, bear in mind the following is current up to February 2012, only applies to ISIS collections, and may have changed.
Panthera leo (no ssp status) was held by 70 collections, with a total of 67,103,1 individuals held.
Recent hybrid Panthera leo was held by 5 collections, with a total of 3,3,2 individuals held.
Congo Lion -Panthera leo azandica- was held by a single collection - Alabama Gulf Coast Zoo - with 0,1 held.
Nowhere in the USA held Katanga Lion (Panthera leo bleyenberghi) or Asiatic Lion (Panthera leo persica)
Transvaal Lion (Panthera leo krugeri) was held by 61 collections with a total of 90,89,13 individuals held.
Masai Lion (Panthera leo massaica) was held by 4 collections with a total of 4,6,14 individuals held. This taxon is synonymous with P. l. nubica, and contains the Tsavo lion.
Denver Zoo held 1,1,2
Detroit Zoo held 0,1,0
International Animal Exchange held 1,1,0
San Diego Zoo held 2,3,12