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is a city in Laclede County, Missouri, United States. The population was 12,155 at the 2000 census. It is the county seat of Laclede County. The Lebanon Micropolitan Statistical Area consists of Laclede County.
Lebanon is located at (37.678203, -92.661694). According to the United States Census Bureau, the city has a total area of 13.7 square miles (35.4 km²), of which, 13.6 square miles (35.3 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.22%) is water.