Ok, Las Vegas should fall between Henderson and Mesquite in alphabetical order, but they're listed separately.
By regional dispatch center, I assume you mean the Phoenix FD Regional Dispatch Center? There are two main regional fire dispatch centers: Phoenix FD and Mesa FD. Phoenix is on the RWC, and also has 15 VHF-High channels. Mesa is on the TOPAZ RWC, and also has a handful of VHF-High channels. I suppose it could be argued that Rural-Metro is the third, since they directly serve communities all around the Valley, as well as provide dispatch services for other departments/districts, such as Circle City-Morristown in the far Northwest Valley, as well as others in Yavapai County.
John
Peoria