City-Data was created in 2003 and provides profiles for all US cities with information on demographics, weather, crime, cost of living, and more. It sees 20 million monthly visitors and offers tools like an interactive data map showing neighborhood-level statistics, a gas usage calculator, and a business search of over 14 million listings. City-Data's forum has over 1.5 million registered users generating 15,000 daily posts, making it one of the most popular local forums in the US.