Hiroo District
District
広尾郡 (Hiroo-gun)
Hiroo District in Tokachi Subprefecture
Coordinates: 42°17′N 143°19′E / 42.283°N 143.317°E / 42.283; 143.317
Country	Japan
Region	Hokkaido
Prefecture	Hokkaido
Subprefecture	Tokachi Subprefecture
Municipalities	Hiroo Taiki
Area
• Total	1,550.06 km2 (598.48 sq mi)
Population  (April 2025)
• Total	10,394
• Density	6.7055/km2 (17.367/sq mi)
Time zone	UTC+9 (JST)

Hiroo (広尾郡, Hiroo-gun) is a district located in Tokachi Subprefecture, Hokkaido, Japan.

As of April 2025, the district has an estimated population of 10,394.^[1] The total area is 1,550.06 km².^[2]

Source:^[1]

• Hiroo
• Taiki

• April 1, 1906 Taiki Village, Rekifune Village, and part of Tōbui Village from the former Tōbui District merge with Moyori Village (now Hiroo Town)
• April 1, 1955 Part of Ōtsu Village, Tokachi District incorporated into Taiki Town.
• On February 6, 2006 the village of Chūrui merged into the town of Makubetsu, in Nakagawa (Tokachi) District.

• Chieda, Yoemon, ed. (1925). Tokachi Hōmeikan 十勝宝盟鑑 [Tokachi Directory] (in Japanese). Tokachi Sankōsha.
• Kadokawa Nihon Chimei Daijiten Hensan Iinkai, ed. (1987). Kadokawa Nihon Chimei Daijiten 1: Hokkaidō 角川日本地名大辞典 1 北海道 [Kadokawa Japanese Place Name Dictionary 1: Hokkaido] (in Japanese). Kadokawa Shoten. ISBN 4040010116.