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Iwamotochō

is a district of Chiyoda, Tokyo, Japan. It consists of 3 chōme. This article also deals with . As of April 1, 2007, the total population of the two districts is 1,989.

Iwamotochō is located on the northeastern part of Chiyoda. The area consisting of both Iwamotochō and Kanda-Iwamotochō borders Kanda-Sakumakaji and Kanda-Sakumachō to the north; Higashi-Kanda to the east; Nihonbashi-Kodenmachō and Nihonbashi-Honchō, Chūō to the south; and Kanda-Sudachō, Kanda-Higashimatsushitachō, Kanda-Higashikonyachō, Kanda-Konyachō, Kanda-Nishifukudachō and Kanda-Mikurachō to the west.

Showa-Dori Avenue runs between Iwamotochō and Kanda-Iwamotochō. Iwamotochō, located east to the avenue, has already undergone modernization of the addressing system while, in Kanda-Iwamotochō, located west to the avenue, the modernization has not been enforced yet. In Chiyoda, many districts in the Kanda area has the prefix Kanda-; the addressing system modernization has not been enforced in such districts.