(A) The term “urban county” means any county within a metropolitan area which— (i) is authorized under State law to undertake essential community development and housing assistance activities in its unincorporated areas, if any, which are not units of general local government; and (ii) either— (I) has a population of 200,000 or more (excluding the population of metropolitan cities therein) and has a combined population of 100,000 or more (excluding the population of metropolitan cities therein) in such unincorporated areas and in its included units of general local government (and in the case of counties having a combined population of less than 200,000, the areas and units of general local government must include the areas and units of general local government which in the aggregate have the preponderance of the persons of low and moderate income who reside in the county) (a) in which it has authority to undertake essential community development and housing assistance activities and which do not elect to have their population excluded, or (b) with which it has entered into cooperation agreements to undertake or to assist in the undertaking of essential community development and housing assistance activities; or (II) has a population in excess of 100,000, a population density of at least 5,000 persons per square mile, and contains within its boundaries no incorporated places as defined by the United States Bureau of the Census.

(B) Any county that was classified as an urban county for at least 2 years pursuant to subparagraph (A), (C), or (D) shall remain classified as an urban county, unless it fails to qualify as an urban county pursuant to subparagraph (A) by reason of the election of any unit of general local government included in such county to have its population excluded under clause (ii)(I)(a) of subparagraph (A) or not to renew a cooperation agreement under clause (ii)(I)(b) of such subparagraph.

(C) Notwithstanding the combined population amount set forth in clause (ii) of subparagraph (A), a county shall also qualify as an urban county for purposes of assistance under section 5306 of this title if such county— (i) complies with all other requirements set forth in the first sentence; (ii) has, according to the most recent available decennial census data, a combined population between 190,000 and 199,999, inclusive (excluding the population of metropolitan cities therein) in all its unincorporated areas that are not units of general local government and in all units of general local government located within such county; (iii) had a population growth rate of not less than 15 percent during the most recent 10-year period measured by applicable censuses; and (iv) has submitted data satisfactory to the Secretary that it has a combined population of not less than 200,000 (excluding the population of metropolitan cities therein) in all its unincorporated areas that are not units of general local government and in all units of general local government located within such county.

(D) Such term also includes a county that— (i) has a combined population in excess of 175,000, has more than 50 percent of the housing units of the area unsewered, and has an aquifer that was designated before March 1, 1987 , a sole source aquifer by the Environmental Protection Agency; (ii) has taken steps, which include at least one public referendum, to consolidate substantial public services with an adjoining metropolitan city, and in the opinion of the Secretary, has consolidated these services with the city in an effort that is expected to result in the unification of the two governments within 6 years of February 5, 1988 ; (iii) had a population between 180,000 and 200,000 on October 1, 1987 , was eligible for assistance under section 5318 of this title in fiscal year 1986, and does not contain any metropolitan cities; (iv) has entered into a local cooperation agreement with a metropolitan city that received assistance under section 5306 of this title because of such classification, and has elected under paragraph (4) to have its population included with the population of the county for purposes of qualifying as an urban county; except that to qualify as an urban county under this clause (I) the county must have a combined population of not less than 195,000, (II) more than 15 percent of the residents of the county shall be 60 years of age or older (according to the most recent decennial census data), (III) not less than 20 percent of the total personal income in the county shall be from pensions, social security, disability, and other transfer programs, and (IV) not less than 40 percent of the land within the county shall be publicly owned and not subject to property tax levies; (v) (I) has a population of 175,000 or more (including the population of metropolitan cities therein), (II) before January 1, 1975 , was designated by the Secretary of Defense pursuant to section 608 of the Military Construction Authorization Act, 1975 ( Public Law 93–552 ; 88 Stat. 1763 ), as a Trident Defense Impact Area, and (III) has located therein not less than 1 unit of general local government that was classified as a metropolitan city and (a) for which county each such unit of general local government therein has relinquished its classification as a metropolitan city under the 6th sentence of paragraph (4), or (b) that has entered into cooperative agreements with each metropolitan city therein to undertake or to assist in the undertaking of essential community development and housing assistance activities; (vi) has entered into a local cooperation agreement with a metropolitan city that received assistance under section 5306 of this title because of such classification, and has elected under paragraph (4) to have its population included with the population of the county for the purposes of qualifying as an urban county, except that to qualify as an urban county under this clause, the county must— (I) have a combined population of not less than 210,000, excluding any metropolitan city located in the county that is not relinquishing its metropolitan city classification, according to the 1990 decennial census of the Bureau of the Census of the Department of Commerce; (II) including any metropolitan cities located in the county, have had a decrease in population of 10,061 from 1992 to 1994, according to the estimates of the Bureau of the Census of the Department of Commerce; and (III) have had a Federal naval installation that was more than 100 years old closed by action of the Base Closure and Realignment Commission appointed for 1993 under the Base Closure and Realignment Act of 1990, directly resulting in a loss of employment by more than 7,000 Federal Government civilian employees and more than 15,000 active duty military personnel, which naval installation was located within one mile of an enterprise community designated by the Secretary pursuant to section 1391 of title 26 , which enterprise community has a population of not less than 20,000, according to the 1990 decennial census of the Bureau of the Census of the Department of Commerce 2 2 So in original. Probably should be followed by a semicolon. (vii) (I) has consolidated its government with one or more municipal governments, such that within the county boundaries there are no unincorporated areas; (II) has a population of not less than 650,000; (III) for more than 10 years, has been classified as a metropolitan city for purposes of allocating and distributing funds under section 5306 of this title ; and (IV) as of October 27, 2000 , has over 90 percent of the county’s population within the jurisdiction of the consolidated government; or (viii) notwithstanding any other provision of this section, any county that was classified as an urban county pursuant to subparagraph (A) for fiscal year 1999, at the option of the county, may hereafter remain classified as an urban county for purposes of this Act.

(E) Any county classified as an urban county pursuant to subparagraph (A), (B), or (C) of this paragraph, and that no longer qualifies as an urban county under such subparagraph in a fiscal year beginning after fiscal year 1989, shall retain its classification as an urban county for such fiscal year and the succeeding fiscal year, except that in such succeeding fiscal year (i) the amount of the grant to such an urban county shall be 50 percent of the amount calculated under section 5306(b) of this title ; and (ii) the remaining 50 percent shall be added to the amount allocated under section 5306(d) of this title to the State in which the urban county is located and the urban county shall be eligible in such succeeding fiscal year to receive a distribution from the State allocation under section 5306(d) of this title as increased by this sentence.