Zip Code - The roughly rectangular area surrounding the tee within which golfers should try to confine the flight of the ball.

Zone, the When everything you do is right, and you know it's right before you do it, that's the zone. The number of times you get to visit the zone, and the amount of time you spend there, is in direct proportion to your ability. So if you want to get in the zone, you'd better visit the practice tee first.