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Usu (有珠郡, Usu-gun) is a district located in Iburi Subprefecture, Hokkaido, Japan. As of March, 2008, the district has an estimated Population of 3,009 and a density of 14.7 persons/km2. The total area is 205.04 km2.
The district has only one town.
Yamato was a town located in Saga District, Saga Prefecture, Japan. The town was established as a village in 1955, what later was elevated to town status in 1959.
Chikujō is a district located in Fukuoka Prefecture, Japan.
Kōnu was a district located in Hiroshima Prefecture.

Kaminiikawa was a district located in Toyama Prefecture, Japan.
Yoshida was a town located in Chichibu District, Saitama Prefecture, Japan.
Ōtaki was a village located in Chichibu District, Saitama Prefecture, Japan.
Kawachi is a district located in Tochigi Prefecture, Japan.
Nishiiwai is a district located in Iwate Prefecture, Japan.
Higashiiwai was a district located in Iwate Prefecture, Japan.

Hamamasu was a district located in Ishikari Subprefecture, Hokkaido, Japan.
Kamiiso is a district located in Oshima Subprefecture, Hokkaido, Japan.
Ōno was a town located in Kameda District, Oshima Subprefecture, Hokkaido, Japan.
Kameda is a district located in Oshima Subprefecture, Hokkaido, Japan.
Kayabe is a district located in Oshima Subprefecture, Hokkaido, Japan.
Yamakoshi is a district located in Oshima Subprefecture, Hokkaido, Japan.
Maruseppu was a town located in Monbetsu District, Abashiri Subprefecture, Hokkaido, Japan. The town's name comes from a word in the Ainu language which means "a wide area where three rivers gather".
Saru is a district located in Hidaka Subprefecture, Hokkaido, Japan.
Nakagawa (Tokachi) (中川郡 (十勝), Nakagawa-gun (Tokachi)) is a district located in Tokachi Subprefecture, Hokkaido, Japan. There is a district with the same name in Kamikawa Subprefecture, see Nakagawa (Teshio) District, Hokkaido.
Futami is a district located in Oshima Subprefecture, Hokkaido, Japan.
Nishi is a district located in Hiyama Subprefecture, Hokkaido, Japan.