I'm in the midst of starting a Junior Circle for AGD in my area (Junior Circle is an alumnae club for younger alumnae) because I was in a similar situation to you when I graduated. I sent a preliminary e-mail a couple of weeks ago, and of the responses I got back, most were along the lines of "Oh, I'm so glad someone is doing this. I have been waiting for someone to get this together." So, if you want an alumnae chapter, chances are that there are others who want one as well and just haven't taken the initiative to start one, or didn't know where to start. If you get the ball rolling, it will probably start to take off on its own.
My situation is a little different from yours in that I am only an hour away from my chapter, so I am able to be an advisor there. If you would like to get involved with chapters in the area, though, you should try contact them directly through either their president or their alumnae relations coordinator. My chapter had an alumna from another chapter come for recruitment this year because she had just moved into the area and she stumbled across our website and asked us what she could do to help.
Good luck to you and let us know what you end up doing!