Walk Score is a large-scale, public access walkability index that assigns a numerical walkability score to any address in Australia, Canada, the United States and New Zealand.. Other services include a transit score, a custom commute report, and an apartment search that locates potential residences based on commute time. Walk Score “ranks communities nationwide (and soon, globally) based on how many businesses, parks, theaters, schools and other common destinations are within walking distance of any given starting point."

Walk Score was founded in 2007. The company’s mission is “to promote walkable neighborhoods... one of the simplest and best solutions for the environment, our health, and our economy.” The index serves more than four million scores per day from more than ten thousand participating websites. Josh Herst, CEO of Walk Score, has stated that he wants Walk Score to be a part of every real-estate listing in the future. He envisions the Walk Score of a home to be as important as how many bedrooms or bathrooms the property has. In January of 2012 Walk Score announced that it had recently raised $2 million from investors.