The letter sent today notes that immigrants start businesses, are clustered in math, science and engineering and can offset any economic drag from baby boomer retirements.
It notes that "the benefits that immigration brings to society far outweigh their costs, and smart immigration policy could better maximise the benefits of immigration while reducing the costs."
Six Nobel laureates were among the 1,470 economists who signed the letter.
The signees come from across the political spectrum, including Austan Goolsbee, an economic adviser to former President Barack Obama, and Glenn Hubbard, who worked for former President George W Bush.