In the late Edo period, the present-day Uchiwaisaichō area was a part of the Hibiya area with many daimyō's mansions and was located within the outer moat of the Edo Castle. Uchisaiwaichō, literally meaning "Inner Happy District", is considered to be named after its location between Saiwaibashi Bridge (幸橋 Saiwaibashi) on the Outer Moat and Saiwai Gate (幸御門 Saiwai-gomon).
After the Meiji Restoration, the term "Uchisaiwaichō" was introduced as a neighborhood in Tokyo.
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- Amundi Japan
- China Airlines
- Ernst & Young ShinNihon LLC
- Fukoku Mutual Life Insurance
- Imperial Hotel
- JFE Steel
- Kroll Inc.
- Mizuho Bank
- NTT Communications
- Shinsei Bank
- Tokyo Electric Power Company (TEPCO)
- "Northeast Asia Archived 2011-07-28 at the Wayback Machine." China Airlines. Retrieved on August 30, 2011. "Tokyo 8F, 1-2-1, Uchisaiwaicho, Chiyoda-ku, Tokyo, Japan"
- "Office locations." Kroll Inc. Retrieved on 14 August 2011. "Tokyo 24/F NBF Hibiya Building, 1-7 Uchisaiwaicho 1-chome Chiyoda-ku Tokyo 100-0011 Japan" "Tokyo (Kroll Ontrack) 24/F NBF Hibiya Building 1-7 Uchisaiwaicho 1-chome Chiyoda-ku 100-0011 Japan"
- "会社概要." Yamato Life. February 5, 2005. Retrieved on January 20, 2010. "所在地 〒100-0011東京都千代田区内幸町一丁目１番７号"