AlegsaOnline.com Home Places Buenos Aires Province Buenos Aires Province Author: Leandro Alegsa Creation date: November 13, 2022 simple.wikipedia.org · CC BY-SA 3.0 The Buenos Aires Province is the largest, richest, and most populated province of Argentina. The province has a population of 13,827,203 (2001) and its capital is La Plata (850,000 inhabitants).