How big is the legion? how many legionnaries are there? 10 thousend? i always wonderd..

Well, IIRC it's comprised of Colorado, Arizona, and New Mexico, so I'd imagine it's a very large entity.

Almost as big as the NCR is supposed to be.

On nma somebody made map of legion and NCR territories, but I don't remember who.

I wouldnt treat fan work as canon if I were you.

i didnt mean the territory..thats the four states commonwealth(arizona,colorado,utah,new mexico) i mean the actual population of the legion...and i think its said somewere in the game that ncr has bigger population

I don't treat this as canon, i just pointed this out, that somebody make map of their territories heard from game sources, but don't remember who.