According to the Migration Policy Institute, about 1/2 million immigrants cross the United States border lawfully each year, with a total of 484,072 immigrants in 2011. Most immigrants come from Mexico, China, India, the Philippines and the Dominican Republic.
Of the total number of people who immigrated to the United States, approximately 3 percent entered with legal refugee status, according to the Migration Policy Institute. The number of people who crossed into the United States as temporary visitors was 165.5 million in 2012. Although the government cannot accurately determine the number of people who immigrate to the United States without legal authorization, the total number is estimated at 11.5 million as of 2011.