Market data sources for RE investments

[Brendon Stewart]

Hi All!  Excited to be making my first blog post here on BP!  

I'm an aspiring investor in the Washington state market and am looking for macro data on counties and/or cities in my state (property values, RE sales data, vacancy rates, migration, etc).  I've seen articles online with this data, but sources are not cited.  Does anybody know if this type of data is open source, and if so, where can I find it?  

Thanks!

Brendon