Fukushima is the southernmost prefecture of Tohoku, and the closest to Tokyo.
On November 1, 2004 the former village of Kitaaizu from the former Kitaaizu District (dissolved by this merger) merged into the (expanded) city of Aizuwakamatsu.
On March 20, 2006, the town of Tajima and the villages of Tateiwa, Ina and Nangou (all from Minamiaizu District) merged to form the new town of Minamiaizu.
On September 1, 2004 the town of Futaba from Kitakoma District and the towns of Ryuou and Shikishima from Nakakoma District merged to form the new city of Kai.
On October 12, 2004, the municipalities of Ichinomiya, Isawa, Misaka, Sakaigawa and Yatasushiro (all from Higashiyatsushiro District) and the town of Kasugai from Higashiyamanashi District merged to form the new city of Fuefuki.
On February 20, 2006 the towns of Tamaho and Tatomi from Nakakoma District and the village of Toyotomi from Higashiyatsushiro District merged to form the new city of Chuo.