Chumen's area is 37.5km2 (14.5mi²) and as of 2018[update] there are 18 villages and 3 residential committees under its authority.

It later rose above sea level when the Yuan dynasty (1341–1367) government enclosed the tideland for cultivation.

[2] During the Hongwu Emperor's reign (1368–1398) in the Ming dynasty (1368–1644), he had his imperial army build the town in 1387, and Chumen was first administered by Yueqing County.

Chumen was governed by Yuhuan officials beginning in 1728, during the Yongzheng Emperor's reign (1722–1735) in the Qing dynasty (1644–1912).

During the Republican period (1912–1949), Chumen was reclassified as a town belonging to Yuhuan County.