The branches of the Iwakura family are the Chigusa family (founded by Arishige CHIGUSA, the second son of Tomotaka IWAKURA) and the Uematsu family (founded by Masanaga UEMATSU, the son of Arishige CHIGUSA).
分家に千種家（具堯の二男千種有能にはじまる）や植松家（千種有能の子植松雅永にはじまる）がある。