The Chiyoda ward was created on March 15, 1947 by the merger of Kanda Ward (the northeast corner of present-day Chiyoda) and Kōjimachi Ward (comprising the rest of Chiyoda).
Chiyoda bydistrikt blev skabt den 15. marts 1947 ved samling af Kanda Ward (i nutidens nordøstlige hjørne af Chiyoda, vest for Akihabara) og Kōjimachi Ward (består af den resterende del af Chiyoda).