Cowart began to develop the neighborhoods that Duke had planned. Initial neighborhoods developed by Cowart included Peachtree Station, Chattahoochee Station, and Spalding Corners. During this period, Cowart developed more upscale housing and laid more sewer pipes than the rest of Gwinnett County. Incorporation The United Peachtree Corners Civic Association (UPCCA), an umbrella group of neighborhood homeowners' associations, was formed in 1993 in response to land use and development concerns in the area. Despite the efforts of the UPCCA, some development opposed by the UPCCA continued in Peachtree Corners throughout the 1990s; therefore, in 1999, the idea of incorporating Peachtree Corners was first proposed. Nonetheless, due to the complexity of existing law, an incorporation movement did not then materialize. A city of Peachtree Corners was again proposed by the UPCCA in 2005, but efforts were abandoned after a straw survey of some residents seemed to indicate that the majority did not support incorporation. In 2010 the UPCCA again pursued the incorporation of Peachtree Corners after a failed attempt by the city of Norcross to annex a portion of Technology Park Atlanta. In a referendum held on November 8, 2011, residents of Peachtree Corners voted to incorporate as Gwinnett County's 16th city, and, with a population of 43,059, it became the county's largest. Municipal operations began on July 1, 2012. Geography Peachtree Corners is located in the western corner of Gwinnett County, 21 miles (33 km) from downtown Atlanta. Seven miles of the Chattahoochee River define the northern and western border of Peachtree Corners, and it is bordered by the cities of Dunwoody, Doraville, and Sandy Springs (DeKalb and Fulton counties) on the west, Buford Highway and Norcross city limits on the south, Roswell and Johns Creek (both in Fulton County) across the Chattahoochee River on the north, and the city limits of Berkeley Lake and Duluth on the east. Demographics 2020 census As of the 2020 United States census, there were 42,243 people, 16,905 households, and 10,668 families residing in the city. The median household income (in 2019 dollars) was $71,149, and the per capita income was $43,783. 2017 Since Peachtree Corners was not a city or a census-designated place at the time, no demographic data is available for the city from the 2010 U.S. Census. However, the city contains ZIP code 30092, which in 2017 had an average adjusted gross income (AGI) of $69,905 per household. The median home price