Lithonia is a suburban town in eastern DeKalb County, Georgia, and it is incorporated as a city. Lithonia's population is about 3,000. However, most parts of Lithonia are unincorporated and are treated as Census Designated Areas.
Lithonia is located at 33°42′46″N 84°6′21″W / 33.71278°N 84.10583°W / 33.71278; -84.10583 (33.712658, -84.105897). According to the United States Census Bureau, this town has a total area of 0.8 square miles (12.0 km²), all land. Although unincorporated areas can account for another 10-15 square miles. Despite its size, even though Lithonia is considered a small town, it has a large suburban community.
"Lithonia" means "city/town of stone". Lithonia is in the heart of the Georgian granite-quarrying and viewing region, hence the name of the town, from the Greek λίθος lithos, for stone. The huge nearby granite dome, Stone Mountain, is composed largely of a rock called Lithonia gneiss, a form of granite. The city of Lithonia is in the metropolitan Atlanta, Georgia area.