41 CFR § 102-83.55
What is a rural area?
June 9, 2020
As defined in 7 U.S.C. 1991(a)(13)(A), rural area means any area other than—
(a) A city or town that has a population of greater than 50,000 inhabitants; and
(b) The urbanized area contiguous and adjacent to such a city or town.