U.S. Routes 19 and 27 run through the center of Lamont, leading southeast 23 miles (37 km) to Perry and west 6 miles (10 km) to Capps. Tallahassee, the state capital, is 29 miles (47 km) west of Lamont via US-27, while Monticello, the Jefferson county seat, is 16 miles (26 km) northwest of Lamont via US-19.
According to the U.S. Census Bureau, the Lamont CDP has an area of 2.4 square miles (6.1 km2), all of it recorded as land. The Aucilla River, which runs along the eastern edge of the community, is a direct tributary of the Gulf of Mexico 25 miles (40 km) to the south.
Ted Turner's 29,000-acre (120 km2) Avalon Plantation is located in Lamont, as is T. K. Wetherell's Oak Hill Plantation.
Lamont CDP, Florida – Racial and ethnic composition Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.