They were founded in Boise. Boise is their HQ and where most of their developer and research staff live. I worked there for almost 9 years. They have several fabs here, all on the same plot of land just outside of town. This will add to it.
Doh.a tiny Google search would have been warranted... Thanks, this explains it.
I interned at that site about 20 years ago. Took me 30+ minutes to walk from one end (where their image sensor R&D was, before they spun it off) to the other end. As a 20 year old, it was amazing to walk past all the various clean rooms, watch the robots and the guys in bunny suits do their thing. A fun experience.