A nice listing of most of the current type foundries can be found on this AAPA site maintained by Dave Tribby... just scroll down the page until you come to "Foundries."
As noted in other posts, the type produced at each of these foundries varies.
Some cast on monotype casters and some cast harder foundry type on Thompson and Barth casters.
The Robison Press
Belmont, CA 94002 (about 25 miles south of San Francisco)