Agree with Chuck. County boundaries are relatively permanent, unlike muncipal limits. The last time County boundaries were adjusted in California was in the late 1940's, I believe, and even then the changes were minor. A county was dissolved about 100 years ago. This seems stable enough for travel forecasting work. /Steve Colman === "If you find something you like, buy a lifetime supply-- they're going to stop making it." --Bob Dolfay