Lawrenceville Depot Lawrenceville's former Seaboard Air Line Railway depot stands at Clayton and Depot Streets on the north side of downtown. The 1910 structure now houses local businesses. The county seat of Gwinnett County in northeast metro Atlanta, Lawrenceville was long a small town but has grown rapidly to its current population of 30,000.     RailGa.com. Georgia's Railroad History & Heritage. © Steve Storey Railroad History | The Depot List | Locomotives On Display | Odds & Ends | Sources & References | Home