My brother is down from Oregon, he doesn't know if he's going to stay or not, but wants to try and get into the electrical union. Only problem is he needs a CA license to do it, but he is unwilling to give up his OR license. When he moved to OR, he had to show 6 mos. proof of residency and relinquish his Ca. license. From what I can tell from the CA DMV site, all he has to do for a Ca. license is fill out the appropriate paperwork and they give him one. It says nothing about giving up his OR DL. I think OR requires proof of residency so that CA doods dont go up there and get a DL and then buy guns over the counter and bring them back into CA. Anywho, is it legal to hold driver's licenses in two or more states?