According to Agent Finch, there are only three Systems Operations Corporations, but only one of them has both John Rainbird and Gill James working there, and that specific building complex is located in Colorado.
Bus Stop Announcer: Your attention, please. Announcing the depature of Greyhound Intercontinental to Edmonton-- Fort Morgan, Lincoln, Burlington, Chicago, and Edmonton, Canada. This is your final boarding call at gate number 6-A.