Official

   In the "Urban Life Metro" on September 9, "Wake with" Yotsuya Post Office "for some reason in Shinanomachi, away from JR Yotsuya Station," the person who is a "walking writer" stated as follows.
 

https://news.yahoo.co.jp/articles/da0cd17b6c15f7bf358b9479aa15367b6f5fc605?page=1

"One day I thought. "Why is the Yotsuya Post Office located near Shinanomachi Station, not Yotsuya Station?" That's right. 　By the way, in front of Yotsuya Station, there is a post office with a similar name called Yotsuya Ekimae Post Office (Yotsuya, Shinjuku-ku), but it is smaller than the Yotsuya Post Office. 　At that time, I felt vague, but after that I started writing articles about walks and understood why. 　It was derived from "Tokyo's 15 wards" established in 1878 (Meiji 11). In the past, Yotsuya Ward existed from Yotsuya to Sendagaya (discontinued in March 1947). Therefore, the Yotsuya Post Office in Shinanomachi was a representative post office in Yotsuya Ward, regardless of JR Yotsuya Station. ・... Not only post offices, but also police stations, fire departments, tax offices, etc., "Why is this name here?" This is mostly related to Tokyo's 15 wards. From 1878 to 1932 (Showa 7), the 15 wards of Tokyo exist, leaving their remnants in various facilities in Tokyo."

　A typical example of "Why is this name here?" in the current Chuo-ku is still a post office.

　The post office located in Tsukiji is located in Tsukiji (4-2-2 Tsukiji, Chuo-ku), but the Japan Post Co., Ltd., Kyobashi Post Office (Harumi Post Office Kyobashi Branch Office), and the Yucho Bank Kyobashi Branch Office, Chuo-ku merged into the former Kyobashi Ward in 1947 and the former Kyobashi Ward.　

　And it goes without saying that the post office in the Tsukishima area is called "Kyobashi Tsukishima Post Office" (4-1-14 Tsukishima, Chuo-ku) is due to the same circumstances.

　Another example of the post office is the Kyobashi Library. The address is "1-1-1 Tsukiji, Chuo-ku government office basement 1.2 floors", but refers to "Kyobashi".