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 that the geographic center of what was then the United States (now the contiguous "Lower 48" states) lies near the town and a monument was subsequently erected at the site. This trivia fact was referenced in the 1969 film "The Computer Wore Tennis Shoes"
Lebanon is located at 39°48′38″N 98°33′22″W / 39.81056°N 98.55611°W / 39.81056; -98.55611 (39.810492, -98.556061). According to the United States Census Bureau, the city has a total area of 0.3 square miles (0.8 km²), all of it land.
As of the census of 2000, there were 303 people, 151 households, and 91 families residing in the city. The population density was 955.5 people per square mile (365.6/km²). There were 204 housing units at an average density of 643.3 per square mile (246.1/km²). The racial makeup of the city was 99.01% White, 0.33% Native American, and 0.66% from two or more races. Hispanic or Latino of any race were 1.32% of the population.