Sources.

  1. Portland Building Permit Data, 
    (2000-2020), sourced from portlandmaps.com
     

  2. Portland Land Use Review Data, 
    (2010-2020), sourced from portlandmaps.com
     

  3. Portland Demographic Data, 
    (2010-2020 & 2000-2010) sourced from census.gov
     

  4. Portland Demographic Maps,
    sourced from opendata.imspdx.org