Manoranjan Sikder also contributed to politics and was a member of the Barisal District Council and the Minority Board. In 1945, he was elected as a member of the Provincial Assembly of East Pakistan. Later, he was appointed as the party whip. In 1956, he joined the provincial cabinet as the Health Minister. After his term as minister, he joined the Barisal District Court to practice law. He played a significant role in promoting education in the region. He established Bauphal Adarsha High School, Karpurkathi D.C.M.E. School, and Rajnagar Minor School. The school in Karpurkathi has since been upgraded to a secondary school. He was also known in the area as a playwright.