not later than 48 hours after the change occurs or, if the change occurs fewer than 48 hours before the date of the election, as soon as practicable after the change occurs. (c) Transparency of Changes Relating to Demographics and Electoral Districts (1) Requiring public notice of changes Not later than 10 days after making any change in the constituency that will participate in an election for Federal, State, or local office or the boundaries of a voting unit or electoral district in an election for Federal, State, or local office (including through redistricting, reapportionment, changing from at-large elections to district-based elections, or changing from district-based elections to at-large elections), a State or political subdivision shall provide reasonable public notice in such State or political subdivision and on the Internet, in a reasonably convenient and accessible format, of the demographic and electoral data described in paragraph (3) for each of the geographic areas described in paragraph (2). (2) Geographic areas described The geographic areas described in this paragraph are as follows: (A) The State as a whole, if the change applies statewide, or the political subdivision as a whole, if the change applies across the entire political subdivision. (B) If the change includes a plan to replace or eliminate voting units or electoral districts, each voting unit or electoral district that will be replaced or eliminated. (C) If the change includes a plan to establish new voting units or electoral districts, each such new voting unit or electoral district. (3) Demographic and electoral data The demographic and electoral data described in this paragraph with respect to a geographic area described in paragraph (2) are as follows: (A) The voting age population, broken down by demographic group. (B) If it is reasonably available to the State or political subdivision involved, an estimate of the population of the area which consists of citizens of the United States who are 18 years of age or older, broken