Yamaguchi is the capital city of Yamaguchi Prefecture, Japan. The city was founded on April 10, 1929. As of February 1, 2010, the city had an estimated population of 198,971 and a population density of 194.44 persons per km². The total area is 1,023.31 km².
Yamaguchi has claim to two famous religious sites: the Buddhist temple, Rurikō-ji, with its five-story pagoda, and the Roman Catholic cathedral connected with Saint Francis Xavier whose work was responsible for the introduction of Christianity to Japan in 1550.
Yamaguchi is served by Yamaguchi Ube Airport in nearby Ube.