The primary drivers for fast growing Pierce, King and Snohomish counties are people who come from other places. From April 2016 through April 2017, the Seattle-Tacoma-Bellevue area was the sixth-fastest growing metro area in the country.
In 1840, males outnumbered females 8.68 million to 8.38 million in the United States. By 1950, there were more females than males for the first time in U.S. history, according to the U.S. Census. See other statistics showing how America has changed.