Usu District, Hokkaidō

The district has only one town.
*Sōbetsu

Timeline

*July 1, 1900 - Due to the Hokkaidō 1st class municipal status enforcement, the village of Date was formed within Usu District. (1 village)
*April 1, 1915 - Due to the Hokkaidō 2nd class municipal status enforcement, the village of Sōbetsu was formed within Usu District. (2 villages)
*1916 - Population: 21,011. Malaria Patients: 20.
*April 1, 1919 - Due to the Sōbetsu, Hokkaidō 2nd class municipal status enforcement, the village of Tokushunbetsu was formed within Usu District. (3 villages)
*June 1920 - Parts of the village of Tokushunbetsu merged into the village of Kimobetsu, Abuta District (now the town of Kimobetsu).
*August 1, 1925 - The village of Date became the 1st class town of Date. (1 town, 2 villages)
*April 1, 1939 - The village of Sōbetsu became the 1st class village.
*June 1, 1943 - 1st and 2nd class municipal status abolished. The village of Tokushunbetu became the Ministry of Interior's designated village.
*October 5, 1946 - Designated municipal status enforcement abolished.
*September 1, 1950 - The village of Tokushunbetsu renamed to the village of Ōtaki.
*January 1, 1962 - The village of Sōbetsu gained town status to become the town of Sōbetsu. (2 towns, 1 village)
*April 1, 1972 - The town of Date gained city status to become the city of Date. (1 town, 1 village)
*March 1, 2006 - The village of Ōtaki merged into the city of Date. (1 town)