Mexico is the most populous Spanish-speaking country.
With a population of 119,530,753 as of 2015 , Mexico is the most populous Spanish-speaking country in the world , the second-most populous country in Latin America after Portuguese-speaking Brazil , and the second in North America , after the United States ; the third largest in the Americas after the two aforementioned countries . Mexico . With an estimated population of over 120 million , it is the eleventh most populous country and the most populous Spanish-speaking country in the world while being the second most populous country in Latin America .