Its the states as well
The latest data, for the year ending July 1, 2025, show that seven of the top ten states gaining residents from elsewhere in the country are all
governed by so-called Republican trifectas, in which the party controls the governorship and both legislative houses—including Texas, South Carolina, Tennessee, and Georgia. The remaining three states in the top ten—North Carolina, Arizona, and Nevada—went for Trump in 2024 and have divided governments that lean Republican. Of the 22 states where Republicans control all branches of government, only three lost population to net migration in the last year. In two of those, Mississippi and Nebraska, the net decline was less than 1,000. In all, Republican states gained a net of nearly 345,000 people from other places.
Democrats will lose 15 seats in the 2030 census plus 5 with redistricting