In a state where the population continues to rapidly swell, the sprawling Dallas-Fort Worth region remains a fundamental source for those gains.

Adding 131,767 residents from 2017 to 2018, the Dallas-Fort Worth-Arlington area gained more residents than any other metropolitan area in the country and was behind more than a third of Texas’ population growth in that period, according to population estimates the U.S. Census Bureau last month.

Following a years-long trend, the new estimates show that Texas dominated in population growth thanks to both growing families and migration to the state. The state took four of the nation’s top 10 spots both for counties that gained the most residents in a year and those that grew the fastest.

Comal County — on the Interstate 35 corridor between Austin and San Antonio — ranked as the nation’s second-fastest-growing county among those with a population equal to or greater than 20,000. The latest census figures peg Comal County’s population at just over 148,000 people, up from about 140,000 a year ago.

Although it was pushed out of the top 10 list for 2017-18, Hays County — also on the I-35 corridor — continues to top the list of Texas counties that have experienced the most rapid growth since the last census. The top five counties on that list — all suburban — have gained more than a third of their residents since 2010.