Most U.S. unauthorized immigrants live in just 20 metro areas | Pew Research Center

"Five of the 20 metros with the largest unauthorized immigrant populations are in California: Los Angeles, Riverside-San Bernardino, San Francisco, San Diego and San Jose. Three – Houston, Dallas-Fort Worth and Austin – are in Texas."

"Some of these areas could be affected by the Trump administration’s promise to take action against localities that do not cooperate with federal officials in identifying unauthorized immigrants. The president’s executive order promises to cut federal funds to these “sanctuary jurisdictions.” Mayors in several big cities have said they will not comply with the order"

http://www.pewresearch.org/fact-tank/2017/02/09/us-metro-areas-unauthorized-immigrants/