Rural
Rural means an area not designated as a metropolitan statistical area by the Census Bureau; segments within metropolitan counties identified by codes 4 through 10 in the Rural Urban Commuting Area (RUCA) system; and RUCA codes 2 and 3 for census tracts that are larger than 400 square miles and have population density of less than 30 people per square mile.
Source
20 CFR § 641.140
Scoping language
The following definitions apply to this part: