Literally... thousands. Each city in each state can have several companies.
Quite a lot, but very few give a fair price. Every dealership has a service garage and there are many other service garages started by the local community, and they usually have a better reputation...
In 2001 the U.S. Forest Service had nearly 30,000 permanent employees and approximately 12,500 contract, summer, and seasonal workers.
a whole lot!!
a lot
100