What are the best ways to research demographics etc for an area?

[Vaughan Moody]

What are the best ways (websites etc) to find out figures like population growth, employment growth, and median wages (or wage growth) for a specific area?

I’m looking for somewhere to buy a new rental property and would like to know these kinds of key metrics for an area, to get an idea of if it’s growing & has potential, or if it’a stagnant.

If there are different places/websites for different states etc, the state in question is California. Thanks.