Well whatever your thoughts, I personally go with the post office. According to their website (which I posted earlier) the actual name for this zip code is San Tan Valley, appropriate names are also Queen Creek, but it IS listed as the actual name being San Tan Valley.
If you go to this link and put in 85140 you can see for yourself:
http://zip4.usps.com/zip4/citytown_zip.jsp
So for mailing purposes and identification purposes that's what I use as that is what the post office has deemed what we are for mail sent to us...for now at least. And quite frankly with the way Queen Creek deals with us I have no desire to be a part of them either. I'm not a sheep, simply going by what the post office uses and considers us for mailing purposes. I could really care less what anyone calls us, but we're NOT Queen Creek so I'd prefer something other than that whether we're incorporated or not but whatever, I didn't move here because of the name of the city I moved here for my own personal reasons and changing our area name, at this point, doesn't change anything else so I really don't care so much what we're called. But again, we are listed as our "actual city name" as being San Tan Valley according to the post office so that is what I go by and use.