was a town located in Kitauonuma District, Niigata Prefecture, Japan. As of 2003, the town had an estimated population of 5,549 and a density of 110.91 persons per km². The total area was 50.03 km². During the 2004 Chūetsu earthquake, Kawaguchi was the only town to report the maximum value of 7 on the Japan Meteorological Agency seismic intensity scale. On March 31, 2010, Kawaguchi was merged into the expanded city of Nagaoka. Transportation Railway JR East - Jōetsu Line JR East - Iiyama Line Echigo-Kawaguchi Highway Kan-etsu Expressway – Echigo-Kawaguchi IC/SA References See also 2004 Chūetsu earthquake Dissolved municipalities of Niigata Prefecture Nagaoka, Niigata