40 U.S. Code § 902 - Definitions
In this chapter, the following definitions apply:
(1) Unit of general local government.— The term “unit of general local government” means a city, county, town, parish, village, or other general-purpose political subdivision of a State.
(2) Urban area.— The term “urban area” means—
(A) a geographical area within the jurisdiction of an incorporated city, town, borough, village, or other unit of general local government, except a county or parish, having a population of at least 10,000 inhabitants;
(B) that portion of the geographical area within the jurisdiction of a county, town, township, or similar governmental entity which contains no incorporated unit of general local government but has a population density of at least 1,500 inhabitants per square mile; and