is a district located in Niigata, Japan. As of July 1, 2019, the district has an estimated population of 10,327 and a density of 10.8 persons per km2. The total area is 952.89 km2. The following municipalities are within the district: Aga History The district was once belonged to Aizu clan and later became part of Wakamatsu Prefecture then to Fukushima Prefecture until 1889 when the district was transferred to Niigata Prefecture. On April 1, 2005, all municipalities within Higashikanbara District (Kamikawa, Kanose, Mikawa, and Tsugawa) merged to form the new town of Aga. Districts in Niigata Prefecture