Lawrenceville is a city in and the county seat of Gwinnett County, Georgia, in the United States. The 2000 census recorded the city's population as 22,397. The Census Bureau estimates the 2008 population at 29,258. Lawrenceville has six ZIP codes (30042-30046, 30049); it is part of the 678/770/404 telephone area code, which is used throughout metropolitan Atlanta.