15 C.F.R. § 90.5 When an informal challenge may be filed.
Title 15 - Commerce and Foreign Trade
An informal challenge to the population or per capita income estimates may be filed any time up to 180 days after the release of the estimates by the Bureau of the Census. Publication by the Bureau of the Census and simultaneous publication of a release notification in the If, however, a State or unit of local government has sufficiently meritorious reason for not filing in a timely manner, the Census Bureau has the discretion to accept the challenge. [50 FR 28768, July 16, 1985]
Title 15: Commerce and Foreign Trade
PART 90—PROCEDURE FOR CHALLENGING CERTAIN POPULATION AND INCOME ESTIMATES
§ 90.5 When an informal challenge may be filed.

