As used in this subchapter, the terms “rural” and “rural area” mean any open country, or any place, town, village, or city which is not (except in the cases of Pajaro, in the State of California, and Guadalupe, in the State of Arizona) part of or associated with an urban area and which (1) has a population not in excess of 2,500 inhabitants, or (2) has a population in excess of 2,500 but not in excess of 10,000 if it is rural in character, or (3) has a population in excess of 10,000 but not in excess of 20,000, and (A) is not contained within a standard metropolitan statistical area, and (B) has a serious lack of mortgage credit for lower and moderate-income families, as determined by the Secretary and the Secretary of Housing and Urban Development. For purposes of this subchapter, any area classified as “rural” or a “rural area” prior to October 1, 1990, and determined not to be “rural” or a “rural area” as a result of data received from or after the 1990, 2000, 2010, or 2020 decennial census, and any area deemed to be a “rural area” for purposes of this subchapter under any other provision of law at any time during the period beginning January 1, 2000, and ending December 31, 2020