The Taiwanese who migrated from western Taiwan to the east coast between 1906 and 1930 (called "double immigrants," as their ancestors had previously migrated to Taiwan from the Chinese mainland) were largely from the prefectures of Taihoku (modern Taipei City and County, Keelung, and Ilan County) and Shinchiku (Hsinchu, Miaoli, and Taoyuan Counties), with Hakka from Shinchiku making up the majority.
因此，自 1906 年到 1930 年間，進入台灣東部的台灣西部移民（即所謂的「二次移民」）中，大部份都是從當時的台北州、新竹州移來的，其中尤其以新竹州的客家移民為主力。