On this site, click on Owners & Projects, then click on Owners/Yachts Registry. Then put in your state and see how many you find listed. Four owners appeared when I tried this today. There are probably more that have not yet registered with this site...
Plan b: put a notice in the Letters section in your local sailing magazine (presuming that you have something like Lat. 38, 48 North, or Santana being printed monthly).