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.