How much Immigrant migration affects total state and local populations

In some states, immigration growth offsets lower or negative domestic population change (the difference between births and deaths). Between 2010 and 2019, foreign-born population growth exceeded native-born population growth in 12 states. Nine of those states lost the native-born population. For example, New Jersey’s foreign-born population increased by 230,000 during the period compared with a 150,000 decline in the native-born population.

Some of the fastest-growing counties in the US attributed half or more of their population growth to increases in foreign-born population. Of the 43 counties that gained more than 100,000 in population from 2010 to 2019, seven had more than half of their growth come from immigrants. About 86% of the 211,000 new residents in Florida’s Miami-Dade County were foreign-born, the highest among those fast-growing counties.

Native-born population decreased by 10,000 or more in 33 counties from 2010 to 2019. Those decreases were offset by increases in foreign-born population in 24 of those counties.

From here.