Highlands Ranch, part of Douglas County, is known as one of the fastest growing communities in the nation. Highlands Ranch grew from the Colorado plains through a series of settlements starting in 1859, with most homesteaders arriving in the 1880s. The homesteads were eventually unified into one grand ranch and mansion. The 1980s began the transformation from a ranch to a community when Mission Viejo started building a master planned community. Today, Shea Homes has almost completed the build out of the area. The people, businesses, and organizations of Highlands Ranch have come together to create an enjoyable community and lifestyle that around 100,000 people call home.