The Census counts 16 establishments in Fairfax County across the classes this site tracks.
This is a small published count: with fewer than 30 establishments, county figures say little about local supply, so lean on the Virginia capacity figures and treat the numbers here as context only.
Virginia overall: 400 establishments across the five classes, of which machine shops are the largest. Fairfax County sits below the state's typical county for these classes.
Sourcing a part in Fairfax County?
Capacity data says where the plants are. To find out what your part costs, send the part.