is a city in Lamar and Pearl River Counties in the U.S. state of Mississippi. It is part of the Hattiesburg, Mississippi Metropolitan Statistical Area. The population was 2,228 at the 2000 census.
Lumberton is located at (31.003888, -89.453544). Most of the city is in Lamar County, with a small portion extending east into adjacent Pearl River County. In the 2000 census, 2,200 of the city's 2,228 residents (98.7%) lived in Lamar County and 28 (1.3%) in Pearl River County.
According to the United States Census Bureau, the city has a total area of 7.3 square miles (18.9 km²), of which, 7.3 square miles (18.8 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.27%) is water.