Analysis of information sources in references of the Wikipedia article "Kawanishi, Niigata" in English language version.
Tokamachi-shi, Kawanishi-machi, Nakasato-mura, Matsudai-machi and Matsunoyama-machi were incorporated into a newly established Tokamachi-shi as of April 1, 2005.
十日町市は、平成17年4月1日に旧十日町市、川西町、中里村、松代町及び松之山町の5市町村が新設合併して誕生しました。