Data sources

Properties Incorporated aggregates data from the most reliable public sources. Here's where it comes from.

Redfin

Redfin is a real estate platform that tracks housing market transactions and inventory across the United States. We use their public data to get:

  • •Median home sale prices (weekly updates)
  • •Active listings and inventory levels
  • •Days on Market (DOM) — how long homes take to sell
  • •Year-over-year price changes and trends

Zillow Research

Zillow publishes extensive research and data on home values and rental markets. We use:

  • •Zillow Home Value Index (ZHVI) — median home values
  • •Zillow Rental Index — rental price trends
  • •Historical data spanning years of market history

U.S. Census Bureau — American Community Survey (ACS)

The Census Bureau's ACS provides detailed demographic and economic data for cities, counties, and zip codes:

  • •Population and demographic breakdowns
  • •Household income and income distribution
  • •Employment rates and job composition
  • •Education levels and school districts

FRED Federal Reserve Economic Data

The Federal Reserve's economic database provides critical context for the housing market:

  • •30-year and 15-year fixed mortgage rates
  • •Economic indicators (inflation, employment, GDP)
  • •Historical data for trend analysis

Why these sources? All of them are public, widely trusted, and regularly updated. We don't model or estimate—we aggregate data that's already published by governments and established organizations.