I don't think that there's anything out there that the general public can access. The state directors for either association might have that information. They also could probably direct you to the person who assigns umpires in your particular area of the state and that might be a good start.
Somewhere, buried way down the list of discussion topics on this forum, the moderators started an "umpire directory" of sorts, where any OFC reader that was an umpire could post his contact information. But the last time I looked at that only a couple of umpires had posted their contact information.
What part of the state are you looking for?