Between 1980 and 1990, the Salvadoran population in the US increased from 94,000 to 465,000. The number continued to grow due to the natural disasters that hit El Salvador. An estimated 1.2 million Salvadoran immigrants are currently in the US which puts them as the sixth largest immigrant group after Mexican, Filipino, Indian, Chinese and Vietnamese foreign born.
Migration Information Source - Salvadoran Immigrants in the United States
The immigrant population from this tiny Central American country is now nearly as large as the immigrant population from much larger China. (As reference, China's total population is 200 times larger and its territory is about 500 times larger than El Salvador's.)