This is Iowa's fastest growing county. And it's among the fastest growing in the country too.

Dallas County remains the fastest growing county in Iowa, according to population estimates from U.S. Census Bureau. And it also ranks among the nation's fastest growing counties.

The metro's western county has increased in population by more than 36.4% since 2010. Dallas County, which includes Adel and portions of Clive, Urbandale, Waukee and West Des Moines, now has 90,180, an increase of about 3,000 residents in the past year.

Census estimates also show strong growth in the Des Moines metro area, as well as the Cedar Rapids and Iowa City areas. However, more than two-thirds of Iowa's counties have lost population since 2010.

Polk County remained the most populous, growing by 56,572 residents since 2010 to 487,204 people as of July 1, 2018. That's an increase of 13.1%.

More:Des Moines ranks fifth 'best place to live' nationally by U.S. News

Previously:How Iowa's midsize cities have been left behind

Linn County, which includes Cedar Rapids, grew by 6.9% to 225,909 to remain the second-largest county, and Scott County, home to Davenport, was third with 173,203.

Johnson County, which includes Iowa City, grew by 15.6% to 151,260.

Of Iowa's 99 counties, 69 lost population, however.

Clinton County had the largest drop, losing 2,599 people. Emmett County lost 10.2% of its population for the state's biggest rate decline.

Register archives and the Associated Press contributed to this report.