We used to have a nice hops producer in central MN (Mighty Axe) but they went out of business a few years ago. I think there are a few other small hops yards in the state, but I believe they deal directly with area craft brewers.
There's Rahr malting in Shakopee, MN, though I'm not sure if their grains are all sourced from the area. It's a big company, and they might have it trucked in from producers around the region. It's still kind of "local" to me and I have brewed with several of their malted grains. Their North Star Pilsner is really nice. Rahr does mostly base malts and a few caramel malts.
Briess is from Wisconsin, so not quite local to me but close enough.