The village amarpur is the headquarter of the development block bearing the same name and is situated  about 19 Kms. away from Banka on Banka Shambhuganj Road. Amarpur is at a distance of 26 Kms from Bhagalpur on Bhagalpur Kajraili Road. According to local tradition, the village was formed by Shah Umar Vajir of Shah Suja, the Governor of Bihar. He rehabilitated the persons who left village Patwai when is was croded by the river Chandan.