372.221—Twin Cities.
For the purpose of determining commercial zones, utilizing the general population-mileage formula as set forth in § 372.241, each of the following combinations of cities shall be considered as a single municipality:
(b)
Having boundaries comprised of their combined corporate limits, with the common portion thereof disregarded:
[41 FR 56654, Dec. 29, 1976, as amended at 62 FR 15422, Apr. 1, 1997]