of Ōi in Ōi District) March 15, 2006 Kitakoma District (北巨摩郡), Yamanashi (The town of Kobuchisawa merged into the city of Hokuto) March 18, 2006 Usui District (碓氷郡), Gunma (The town of Matsuida merged with the city of Annaka to form the city of Annaka) March 19, 2006 Nishiibaraki District (西茨城郡), Ibaraki (The towns of Tomobe and Iwama merged with the city of Kasama to form the city of Kasama) March 20, 2006 Sakai District (坂井郡), Fukui (The towns of Sakai, Mikuni, Maruoka, and Harue merged to form the city of Sakai) Shiga District (滋賀郡), Shiga (The town of Shiga merged into the city of Ōtsu) Katō District (加東郡), Hyōgo (The towns of Yashiro, Takino, and Tōjō merged to form the city of Katō) March 27, 2006 Niihari District (新治郡), Ibaraki (The village of Tamari merged with the towns of Ogawa and Minori from Higashiibaraki District to form the city of Omitama) Tsukuba District (筑波郡), Ibaraki (The town of Ina and the village of Yawara merged to form the city of Tsukubamirai) Nitta District (新田郡), Gunma (The town of Kasakake merged with the town of Omama from Yamada District and the village of Azuma from Seta District to form the city of Midori) Yamada District (山田郡), Gunma (The town of Omama merged with the town of Kasakake from Nitta District and the village of Azuma from Seta District to form the city of Midori) Sōsa District (匝瑳郡), Chiba (The town of Hikari merged with the town of Yokoshiba from Sanbu District to form the town of Yokoshibahikari in Sanbu District) Shisō District (宍粟郡), Hyōgo (The town of Yasutomi merged into the city of Himeji) Shikama District (飾磨郡), Hyōgo (The towns of Ieshima and Yumesaki merged into the city of Himeji) March 31, 2006 Shizunai (静内郡) and Mitsuishi (三石郡) Districts, Hokkaido (Merged to form Hidaka District (日高郡)) Shida District (志田郡), Miyagi (The towns of Sanbongi, Matsuyama, and Kashimadai merged with two towns from Tamatsukuri District, the town of Tajiri from Tōda District, and the city of Furukawa to form the city of Ōsaki) Tamatsukuri District (玉造郡), Miyagi (The towns of Iwadeyama and Naruko merged with three towns from Shida District, the town of Tajiri from Tōda District, and the city of Furukawa to form the city of Ōsaki) Minamitakaki District (南高来郡), Nagasaki (The towns of Kazusa, Kuchinotsu, Minamiarima, Kitaarima, Nishiarie, Arie, Futsu, and Fukae merged to form the city of Minamishimabara)