Which US counties have the largest immigrant communities?

In 2023, the states with the largest shares of foreign-born residents were California (27.3%), New Jersey (24.2%), New York (23.1%), Florida (22.1%), and Nevada (19.3%).

In each of these states, immigrants tend to be concentrated in counties with major metropolitan areas.

The top 10 counties are the exception in the US: most counties have a relatively low foreign-born population, and in 75% of them, fewer than 6.05% of residents are foreign-born. 

Current estimates show 12 counties with no foreign-born residents at all: Owsley County, Kentucky; Sharkey and Wilkinson Counties, Mississippi; Garfield County, Montana; Blaine and Hooker Counties, Nebraska; Buffalo, Haakon, and Mellette Counties, South Dakota; Cottle and Roberts Counties, Texas; and Niobrara County, Wyoming. Each of these counties have total populations of fewer than 9,000 people.