11 CFR § 110.18
Voting age population
June 10, 2020
There is annually published by the Department of Commerce in the Federal Register an estimate of the voting age population based on an estimate of the voting age population of the United States, of each State, and of each Congressional district. The term voting age population means resident population, 18 years of age or older.
[68 FR 457, Jan. 3, 2003]