Districts of Afghanistan are known as wuleswali (Pashto: ولسوالۍ or wuləswāləi; Persian: شهرستان), which are one level below the provinces. The number of districts has fluctuated over the years, with new districts created by splitting or merging parts of others. Prior to 1979, there were 325 districts but a major reorganization in 2004 led to the number increasing to 397. As of June 2005, the Afghan Ministry of the Interior recognised 398 districts, divided between the 34 provinces. This number is expected to change with further administrative reorganization.
More information on the Wikipedia page .