Examines the economic role of immigrants in the 25 largest metro areas in the U.S. The results are clear: immigrants contribute to the economy in direct relation to their share of the population. The economy of metro areas grows in tandem with the immigrant share of the labor force. And, immigrants work across the occupational spectrum, from high-paying professional jobs to low-wage service employment. In the 25 largest metro areas combined, immigrants make up 20% of the population and are responsible for 20% of economic output. Together, these metro areas comprise 42% of the total population of the country, 66% of all immigrants, and half of the country¿s total GDP. Charts and tables.