Lilburn is a city in Gwinnett County, Georgia, United States. The population was 11,596 at the 2010 census. The estimated population was 12,810 in 2019. It is a developed suburb of Atlanta and a part of the Atlanta metropolitan area.
Lilburn is located in western Gwinnett County at 33°53′20″N 84°8′27″W (33.888853, -84.140897). U.S. Route 29 (Lawrenceville Highway) passes through the center of town, leading southwest 19 miles (31 km) to downtown Atlanta and northeast 11 miles (18 km) to Lawrenceville, the Gwinnett County seat.
According to the United States Census Bureau, Lilburn has a total area of 6.4 square miles (16.5 km2), of which 6.3 square miles (16.4 km2) is land and 0.04 square miles (0.1 km2), or 0.82%, is water.
The city of Lilburn was founded in 1890 by the Seaboard Air Line Railway. The area previously known as "McDaniel" was renamed "Lilburn", after the general superintendent of the railroad, Lilburn Trigg Myers of Virginia. (The basis of the name change got no official mention at the time, and historical researchers did not confirm the specific link to Myers until the 1990s.) The town prospered and was incorporated as Lilburn on July 27, 1910.
A devastating fire and hard economic times in the 1920s ended the prosperity.