As of 2003, the town has an estimated population of 7,535 and a density of 206.61 persons per square kilometre (535.1 per square mile). The total area is 36.47 km2 (14.08 sq mi).
^住民基本台帳人口移動報告年報 [Annual Report on Population Movement in the Basic Resident Register] (in Japanese). 総務庁統計局. 2005. p. 139. Nakanoshima-machi, Koshiji-machi, Mishima-machi, Yamakoshi-mura and Oguni-machi were incorporated into Nagaoka-shi as of April 1, 2005.