Since the 1980s, new communities have continued to develop, with Greatwood, New Territory, and Sienna (originally Sienna Plantation) among the more recent notable developments. In addition to continued development in the eastern part of the county around Sugar Land and Missouri City, the Greater Katy area began to experience rapid growth and expansion into Fort Bend County in the 1990s, led by the development of Cinco Ranch. By 2010, the county's population exceeded 500,000, and it had become the second-largest county in the greater Houston area (behind Harris County).