Panel On US Population By State (1980-now)

This should be the most basic of the basic. Still, I cannot find an appropriate dataset nor an actually solved post in this subreddit (unless I’m blind).

People refer to the US census, but that is survey data and doesn’t actually count the total population. There does appear to be some sort of count every 10 years. But is that really all? Should I just assume linear growth between each 10-year measuring point?

This seems weird for a country known for good data.