This polygon datalayer includes China county boundaries with 1990 population census data. It is one (Part B) of two layers containing the entire 1990 population census data. The 1990 administrative maps were primarily based on the 'The Administrative Maps of the People's Republic of China,' published by China Map Press, and some other yearly administrative maps. This datalayer is part of the Historical county population census data with maps: 1953, 1964, 1982, 1990, 2000 data set produced by the All China Marketing Research Co. and distributed by the University of Michigan, China Data Center (2005). The historical county population Census data include population Census data for China at county level for 1953, 1964, 1980, 1990, and 2000, which are integrated with associated county GIS maps.