Lilburn is a city in Gwinnett County, Georgia, in the United States. The population was 11,596 at the 2010 census. It is part of the Atlanta metropolitan area.
Lilburn is located at 33°53′20″N 84°8′27″W / 33.88889°N 84.14083°W / 33.88889; -84.14083 (33.888853, -84.140897).
According to the United States Census Bureau, the city has a total area of 6.2 square miles (16.1 km²), of which, 6.2 square miles (15.9 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.81%) is water.