Sister State: Commonwealth of Massachusetts–Hokkaido
Amherst–Kanegasaki, Iwate Prefecture
Arlington–Nagaokakyo, Kyoto Prefecture
Cambridge–Tsukuba Science City, Ibaraki Prefecture
Concor– Nanae, Hokkaido
Fairhaven/New Bedford–Tosashimizu, Kochi Prefecture
Gloucester–Tamano, Okayama Prefecture
Marlborough–Akiruno, Tokyo
Medford–Nobeoka, Miyazaki Prefecture
Plymouth–Shichigahama, Miyagi Prefecture
Salem–Ota, Tokyo
Springfield–Takikawa, Hokkaido