There are school bus drivers living in the District of Columbia. There are housecleaners and dishwashers and child care providers, too. There are construction workers, plumbers, electricians and gardeners. There are bartenders and parking lot attendants, cops and firefighters.
I know this. I am a native of D.C. (Go Randle Highlands Hornets!), and I have seen them with my own eyes. You can, too, by simply boarding a Metrobus on any given day (the busy 14th Street corridor is a fine place to start) and simply paying attention. They are not difficult to find.