Unincorporated San Bernardino County. Joshua Tree shares its name with the national park and sits next door to an incorporated town, but it is not a city and has no municipal short-term rental code of its own. Chapter 84.28 of the County Code applies, administered through the County's short-term rental program. Yucca Valley, immediately west, is an incorporated Town under its own Ordinance 312, and Twentynine Palms, to the east, is an incorporated City with its own Vacation Home Rental licence. Three neighbouring places, three different processes. Checked 2026-09-20.