Vintage population data - I see it often in the news, but it's so limited perhaps a trend or pulse, but does anyone here actually use compare?

I've used it often. It provides county-level baseline annual population data. It can be used as a denominator with any number of county-level datasets from other sources. Unlike ACS, it provides full county coverage (not just counties with population > 65,000) for single years.

Yes it’s a critical and eagerly awaited dataset especially in the current pandemic flux of moving patterns. It will be the population control for ACS  when it comes out later this year (if you think about, how could a survey tell you population? You have to estimate it and make the assumption going in) 

Thanks, is there any other population set that's significant to ACS or is this the only one,