While the Morongo Basin can be defined by the political boundaries of the Morongo Unified School District, or by its geographical and ecosystem boundaries as the southernmost portion of the Mojave Desert, it is best known as a series of gateway communities along the north boundary of Joshua Tree National Park. The Marine Corps Air Ground Combat Center in Twentynine Palms forms a good part of the Basin's northern boundary. Twentynine Palms Highway (California State Route 62) is the lifeline transportation corridor for the Basin starting at Interstate 10 near Palm Springs, heading northeast and then east to the Arizona border.
San Bernardino County recognizes these distinct unincorporated communities which are entitled to membership on the San Bernardino County Third Supervisorial District Municipal Advisory Council:
|Joshua Tree||Copper Mountain Mesa|
|Morongo Valley||Wonder Valley|
|Yucca Mesa||Johnson Valley/Homestead Valley|