Since King Of Prussia is near Philadelphia, it's a great idea to pursue Philadelphia Sports while living in King Of Prussia. You can get to the events either by car or by train. Philadelphia is close enough that you can attend sports events on a typical "work evening" and still be able to go to work the next day. Here is the rundown on the sports teams:
Philadelphia Eagles - The Philadelphia Eagles professional football
Philadelphia Phillies - The Philadelphia Phillies Major League Baseball team
Philadelphia 76ers - The 76ers pro basketball team
Philadelphia Flyers - The Flyers pro hockey team
Philadelphia Soul - The Soul arena football team
Philadelphia Phantoms - The Phantoms AHL Hockey Team
Philadelphia Barrage - The Barrage Lacrosse Team
Philadelphia Kixx - The Philadelphia Kixx Soccer team