2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6241This paper reviews recent results on populations of compact X-ray sources in galaxies, mostly based on Chandra and Newton-XMM work.35 pages and 14 figs. Draft of Chapter for the "Compact Stellar X-ray Sources" book in preparation for Cambridge University Press (eds., W. Lewin & M. van der Klis)Astrophysicstext