According to the Hispanic Community Health Study, the Bronx County population, the 27th largest county in the US, represents one of the largest, oldest, and most well-established concentrations of Hispanic/Latino individuals in the US. The Bronx is home to 644,705 Hispanic/Latino individuals, representing 48% of the 1.3 million Bronx residents (at the county level, the second highest percentage of Latinos anywhere east of the Mississippi River). Of the 5 boroughs of New York, the Bronx has the largest proportion of Hispanics/Latinos. Puerto Ricans are the most represented Hispanic/Latino subgroup in the Bronx (50%, n=319,240), followed by Dominican (21%, n=133,087) and Mexican (5%, n=34,377) individuals.