HomeSight

Zillow's public research division releases monthly housing statistics at the ZIP code level — the most granular publicly available housing dataset in the U.S. All five metrics HomeSight tracks come from this source.

The U.S. Census Bureau publishes TIGER/Line shapefiles containing ZIP Code Tabulation Area (ZCTA) boundary polygons — the geographic shapes drawn on the map for each ZIP code.

An open geographic database providing coordinates, city names, and state associations for every U.S. ZIP code — used to center the map when you search a ZIP and populate the city labels in tooltips and panels.