在XX市XX镇人民政府工作，怎么说？

work in township (town) people's governments of XX town, xx city.

主要是 镇人民政府的翻译，请参考：

The use of land for building houses should be examined by the township (town) people's governments and approved by the county people's governments.
农村村民住宅用地，经乡(镇)人民政府审核，由县级人民政府批准；

In XX city XX town people's government work

work in the XX town People's Government office in XX city.