Most rural states have had some growth as people don't want to live in big cities anymore. Covid has exacerbated the issue as anyone who could telework or could retire as done so.
This has pushed housing prices up, caused public schools in popular areas to burst with new students and lead to changes in voting demographics.
Here in New Mexico we have actually become more conservative as most of the people that fled big cities were Republicans that didn't want to live in Boston, Cleveland or Las Vegas anymore. If it wasn't for the people we take in from Mexico we would probably flip red.
Wyoming, Idaho and Montana have also had huge numbers of people leave for other states. I don't remember the exact numbers, but many rural Western States had more people move to California in 2019 than they did move from California or it was very close. Colorado, Texas, Florida and other states did not. They got 30-50% more Californians than they sent to California.
When you drive through newer Las Cruces suburbs you see license plates from all over the country in newer housing developments. My parents live in Cheyenne and my cousin's live in Casper and it is the same. But there are plates from Wyoming, Idaho and Montana here too.
People move, they have always moved. The pandemic has made things worse, and there is nothing you can do to change that.
My grandfather told me that when he immigrated from Germany in the 1930's that people complained that there were too many immigrants in Wyoming.
I spent a month in the Yukon living out of my RV in 2014. I met people from all over the world, and many of them were trying to move there or had moved there.
There are 330,000,000 Americans as much as we'd like to have the entire Gila, Grosse Ventre, Bob Marshall or any place else to ourselves those days have been over for 50 years.