Board Thread:Suggestions forum/@comment-30303386-20170416221408/@comment-25754873-20170417154901

Lord Eldacar wrote: This chap did some calculations which I find pretty reasonable, putting Gondor's population at around 1-2 million. That's a large population for Middle-Earth, as most of the continent is sparsely populated.

http://www.stephenwigmore.com/2012/08/populations-of-middle-earth-lord-of.html I personally think that Gondor could field an army about 50,000 strong, so that seems reasonable.