29 CFR 780.811: Exemption dependent upon place of employment generally.

Under the first part of section 13(b)(15), if the employee's work meets the requirements for exemption, the location of the place of employment where he performs it will determine whether the exemption is applicable. This location is required to be in a county where cotton is grown in commercial quantities. The exemption will apply, however, to an employee who performs such work in “any” place of employment in such a county. The place of employment in which he engages in ginning need not be an establishment exclusively or even principally devoted to such operations; nor is it important whether the place of employment is on a farm or in a town or city in such a county, or whether or to what extent the cotton ginned there comes from the county in which the ginning is done or from nearby or distant sources. It is enough if the place of employment where the employee is engaged in ginning cotton for market is “located” in such a county.