The Census counts 14 establishments in Yellowstone 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 Montana capacity figures and treat the numbers here as context only.
Montana overall: 91 establishments across the five classes, of which machine shops are the largest. Yellowstone County sits below the state's typical county for these classes.
Sourcing a part in Yellowstone County?
Capacity data says where the plants are. To find out what your part costs, send the part.