Distributions to counties within a region, excluding the host county and host municipality, shall be made in proportion to the population of each such county as shown by the latest preceding decennial Federal census completed and published as a final population count by the United States census that precedes the commencement of the calendar year in which such distribution is made.
N.Y. Comp. Codes R. & Regs. Tit. 9 § 5302.7