Zillow, an online real estate company, provides real estate and mortgage data for the United States through a REST API. The ZillowR package provides an R function for each API service, making it easy to make API calls and process the response into convenient, R-friendly data structures. See <https://www.zillow.com/howto/api/APIOverview.htm> for the Zillow API Documentation. NOTE: Zillow deprecated their API on 2021-09-30, and this package is now deprecated as a result.