Lebanon is a city in Smith County, Kansas, United States, in the north central part of the state. As of the 2010 census, the city population was 218.
In 1918, a scientific survey established the geographic center of the 48 contiguous US states about 2.6 miles (4.2 km) northwest of Lebanon, and a monument was subsequently erected at the site. The geographic center of all 50 of the US states is located near Belle Fourche, South Dakota.
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