Main Page | See live article | Alphabetical index Kosai (湖西市; -shi) is a city located in Shizuoka, Japan. As of 2003, the city has an estimated population of 43,525 and the density of 790.21 persons per km². The total area is 55.08 km². The city was founded on January 1, 1972. External Links Official website in Japanese This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.