MILESTONES
- 1948
- Tane Matsukata returns to Japan after 17 years in the United States
- 1949
- Classes begin for four students in the Murata home with three teachers
- Nishimachi School is founded and formalized by the Minato-ku Government
- 1951
- First school building is completed
- 1953
- First elementary graduation takes place
- 1955
- Nishimachi School is recognized as Jun Gakko Hojin by the Tokyo Metropolitan Government
- 1956
- Primary language of instruction becomes English
- Japanese classes begin with two Japanese students
- 1958
- Kindergarten is added
- 1962
- Japanese-language studies become a requirement for all students
- 1963
- Junior high is added
- 1965
- Matsukata House reverts to the Matsukata family from the Venezuelan government
- 1966
- School name is changed to Nishimachi International School
- First junior high graduation takes place
- Tradition of annual ski trips begins
- First Food Fair is held
- 1970
- Student Council (StuCo) is established
- Camp Rioichiro Arai is dedicated at Kazuno, Gunma-ken
- 1973
- First Japanese program and speech contest are held
- 1980
- Tomo no Kai (parent association) is formed
- 1985
- Phase I building (Ushiba Memorial Gymnasium) is completed
- 1986
- Nishimachi is accredited by W.A.S.C. (Western Association of Schools and Colleges)
- Phase II building (primary building) is completed
- 1989
- Founder, Tane Matsukata, passes away
- Tane Matsukata Fund for International Education (scholarship fund) is established
- 1990
- New lodge at Camp Rioichiro Arai is completed
- 1991
- Nishimachi-Kai (alumni association) is formed
- 1993
- Japanese presentation program replaces Japanese speech contest
- 1994
- Sister school ties with Kurohone elementary and junior high school are formalized
- 1997
- Phase III building (upper elementary and junior high building) is inaugurated
- 1999
- W.A.S.C. self-study is completed and six-year accreditation awarded
- 2000
- Middle school program replaces junior high school
- 2001
- ERB standardized testing begins
- Nishimachi builds and supports Kirivorn School in Cambodia
- 2002
- Kindergarten is relocated to the Moto Azabu Hills complex
- 2003
- Outreach Scholarship for Student Diversity is established
- 2004
- Tokutei Koeki Zoshin Hojin (Special Public Interest Promotion Organization) status is granted by Tokyo Metropolitan Government
- 2006
- W.A.S.C. and C.I.S. (Council of International Schools) joint accreditation awarded
- 2007
- Phase IV building (Yashiro Media Center) is inaugurated
- Multi-purpose area, under the gym, is renovated
- 2009
- Reinforcement work of the Matsukata House is proposed