This paper charts the growth and development of the Latino population of the northeastern U.S. from 1970 to 2015. The relatively small population dominated by Puerto Ricans and concentrated in New York and a few other cities has evolved into a large, diverse, and more geographically dispersed population. It grew from 1.9 to 7.7 million persons and rose from 3.8% to 10.5% of the regional population. It has increasingly suburbanized with roughly equal numbers of Latinos living in cities and suburbs. They are the most diverse Latino population of all regions in the U.S., they are not dominated by Mexicans, they are predominantly documented, and the large majority are citizens.