According to the recent Census Bureau report in March 2018, the South and West regions of the US are leading in US population growth (not a surprise).
That said, 6 of the 10 counties with the reported fastest growing counties were in Texas, and the 4 others included Maricopa County, Arizona; Clark County, Nevada; Riverside County, California; and King County, Washington.
Among these, the largest increase recorded was in Maricopa County with 74,000 new residents. That increase puts Maricopa in 4th place for the nation’s largest county, with a total of 4.3 million residents.
Not too shabby, but if you live here (like we do), you can feel the growth in bad (and good) ways.