Foreign-Born Population from Vietnam, by Age and Sex, for the United States: 2000
The age-sex pyramid of the foreign-born population from Vietnam has many of the same characteristics as the “diamond shape” population pyramid of the total foreign born. This includes the largest number of immigrants in the economically active ages of 20 to 54 and relatively smaller numbers under age 20 and over age 54. Unlike the high male-to-female ratios of the Mexican and Indian populations and the low male-to-female ratios of the Filipino and Chinese populations, the Vietnamese male-to-female ratio is 99, which indicates an approximately equal number of male and female migrants.
Migration Policy Institute tabulations of the U.S. Census Bureau's 2000 Census data.