Immigration Law (U.S.) Research Guide

Includes the Yearbook of Immigration Statistics and other DHS statistics publications.

Quick immigration facts about the U.S.

Current national and state-level demographic, social, and economic facts about immigrants to the United States; as well as stock, flow, citizenship, net migration, and historical data for countries in Europe, North America, and beyond.

Comprehensive, independent and nonpartisan information about U.S. federal immigration enforcement from the Transactional Records Access Clearinghouse (TRAC) at Syracuse University.

Not immigration specific, but extensive statistics are available with a simple search for "immigration"

The "foreign-born population" designation includes anyone who is not a U.S. citizen at birth, including those who become U.S. citizens through naturalization.