Peachtree Corners is a city in Gwinnett County, Georgia, United States. Peachtree Corners became a city in 2012, making it one of the newest cities in the state of Georgia. It is part of the Atlanta metropolitan area, and is the largest city in Gwinnett County with a population of 42,243. The city is home to the Technology Park Atlanta, a business park that has become a hub for technology and telecommunications companies.