At the beginning of 19th century, Moc Nam Commune was part of Moc Hoan Canton (tổng Mộc Hoàn), Phu Xuyen District, Thuong Tin Prefecture, Hanoi Province. On October 20, 1890, the French colonialists merged parts of Hanoi and Nam Dinh to establish Ha Nam Province. Moc Hoan and Chuyen Nghiep cantons of Phu Xuyen District, Thuong Tin Prefecture, and Trac But Canton of Nam Xang District, Ly Nhan Prefecture were merged into Duy Tien District. Between October 1890 and the prelude of the August Revolution of 1945, Moc Nam had been part of Moc Hoan Prefecture, Duy Tien District. Moc Hoan consisted of 10 communes, namely Nha Xa, Yen Lac, Lanh Tri, Do Quan, Yen Ninh, Yen Hoa, Hoan Duong, Di Pho, Yen Tu, and Kha Duy. The post revolution period witnessed the abolishment of “prefecture” as an administrative unit. Administrative units in Duy Tien were re-organized with the unity of 88 small communes, giving birth to 20 bigger units.