Apparently the population of Mississippi (blue on above map, just to the east of the Mississippi River, with panhandle to the coast) has dropped (slightly, about 6000 people) in absolute numbers.

This is in an overall situation where the South is the fastest growing region of the country. And regardless of whether the census-taking system might have had some inherent or systemic bias, it seems that the loss is primarily in the white community. The African American and Latinx count went up, but the white numbers went down by more: about 48,000 in a state of 3 million.

Apparently everybody is moving to Texas. Another theory is that the republican good ol' boys refused to fill out that dang govermint paperwork.