Rural-Urban Commuting Area (RUCA) Codes
A list of rural-urban commuting area (RUCA) code data sets, including RUCA codes by ZIP code. RUCA codes classify U.S. census tracts using measures of population density, urbanization, and daily commuting. The most recent RUCA codes are based on data from the 2010 decennial census and the 2006-10 American Community Survey decennial census.
USDA Economic Research Service
Frontier and remote areas · Rural definitions