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Prior to the arrival of Tokugawa Ieyasu, it was known as Kōjimura (糀村?). The area developed as townspeople settled along the Kōshū Kaidō. In 1878 Kōjimachi became a ward in the city of Tokyo. It was the forerunner of Chiyoda which is now a special ward. Kōjimachi was the birthplace of Japanese general and prime minister Hideki Tojo, who was hung for war crimes after World War II.
The Kōjimachi ward was larger than past day Kōjimachi. The area centered upon Kōjimachi including the districts of the Banchō area, Kudanminami, Kioichō, Hirakawachō and Hayabusachō is sometimes referred as the Kojimachi area (麹町地区).
In the area
- Sony Music Entertainment
- The Boston Consulting Group (BCG), a global management consulting firm and the world's leading advisor on business strategy
- Embassy of Ireland
- Nippon Television had its headquarters here, and maintains offices in the former headquarters building
- Nitto Boseki, a textile and fiberglass products company
- Tokyo FM
- Tokyo Metropolitan Television
- Tokaido, manufacturer of karate uniforms
- Hanzōmon Station, Station Z-05 on the Tokyo Metro Hanzomon Line
- Kōjimachi Station, Station Y-15 on the Tokyo Metro Yurakucho Line