From Department of Housing and Urban Development:

https://data.hud.gov/section3.html

Carto Data Observatory: https://carto.com/developers/cartoframes/

From open data: https://gis-pdx.opendata.arcgis.com/datasets/512bf377ee5a422da05bc36118523cdb_240

From Yelp review:

https://www.yelp.com/developers/documentation/v3

County Business Patterns Data & American Community Survey from:

https://www.census.gov/

CityIQ is a repository of sensor data, more information from:

https://github.com/CityIQ

From Google review: https://developers.google.com/places/web-service/intro