Don, you really should tell others about this info.
It seems no one else knows it. I had no idea there were other places to update my address with the immigration guys. When I go to immigration to get my address info updated, my Thai boss takes me (from Lopburi). Even HE doesn't know of any other places we could go to get it done, and he's the director of my government school.

Also, every time I've gone, I've been told by the guys in room 401 "90 day, come back here." I've thus done as I've been told and have gone to Bangkok when I need the stamp.

I'll be leaving Thailand in the coming weeks, so I don't need (thankfully) to visit 401 anymore. I hope others will be able to avoid running to BKK every three months for the few seconds it takes for an immigration official to simply stamp a piece of paper. Apparently, it CAN be done in other places. I wish I would have known that about 8 months ago.

SS