Lilburn is located in western Gwinnett County at 33°53′20″N84°8′27″W / 33.88889°N 84.14083°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.
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