The brand is so ubiquitous that the Multiple Listing Service of homes for sale includes the Key Map designation along with addresses. If you want to make sure the plumber knows exactly where he should come to repair that broken faucet, you would do well to find out the Key Map number for your home and supply it to him. The first Key Map only covered the city of Houston. Today, it includes all the city limits and unincorporated Harris County. There also are Key Maps for Fort Bend, Montgomery and Galveston-Brazoria counties.
Sales get stronger every year.
A local competitor folded years ago. Well, it's a private company that doesn't publish its figures. But Rau drives a Porsche. In this case, the map business is turning into the directions business. Type your address into the computer, and the address where you want to go.