Search through all Franklin County Missouri Luxury Homes for sale above $500,000. Defining ‘ luxury ‘ isn’t just anything for sale above a certain price, it can mean different things to different people. Luxury is defined as ‘ the state of great comfort and extravagant living ‘ . Luxury homes for sale in Franklin County can mean anything from a simple 1500sq ft home with top upgrades in a new subdivision to a 100 acre farm to executive style homes.