[2] It is bordered by the Dadu River to the north, Shengang and Xianxi to the west, Lukang and Xiushui to the south, and Changhua City to the east.

An early name for the area that is now Hemei was Khah-lí-siān (卡里善), taken from the aboriginal Babuza language.

Hemei encompasses 39.93 square kilometers and a population of 88,740, including 45,035 males and 43,705 females (January 2023).

[3] The township comprises 32 villages, which are Daxia, Detan, Ganjing, Haishe, Haoxiu, Hebei, Henan, Hetung, Hexi, Hunei, Jiabao, Jiali, Licheng, Mianqian, Nandian, Renai, Shanli, Sizhang, Tangyou, Tieshan, Touqian, Tucuo, Xinzhuang, Yagou, Yuanbei, Yuemei, Zengping, Zhaoan, Zhongliao, Zhongwei, Zhuying and Zhuyuan.

In 2017, Changhua County Magistrate Wei Ming-gu announced intentions to have the Taichung Metro's Green Line extend beyond Changhua City to area such as Hemei.