Chuo-ku(12101), Hanamigawa-ku(12102), Inage-ku(12103), Wakaba-ku(12104), Midori-ku(12105) and Mihama-ku(12106) are newly established in Chiba-shi.
中央区(12101)、花見川区(12102)、稲毛区(12103)、若葉区(12104)、緑区(12105)、美浜区(12106)の新設