Boston's immigrant labor force makes up nearly 30% of the city's total labor force. While immigrants traditionally came from Europe, current immigrants are more likely to come from Latin America, the Caribbean, and Asia. Over 70% of immigrants in Boston's labor force arrived since 1990. Less than half are naturalized citizens, and about half speak English proficiently. Compared to native-born workers, immigrants are more likely to be older, less educated, and from non-white racial groups. The report examines the socioeconomic characteristics and labor market integration of these immigrant workers.