This polygon shapefile represents the boundaries of counties in China with 2010 Population Census Long Form data. Two types of questionnaires (long form and short form) were used for the 2010 population census. The short form contains items that reflect the basic situation of the population, while the long form includes all short form items plus other items such as migration, education, economic activities, marriage and family, fertility , housing , etc. According to the National Bureau of Statistics of China, the households for the Long Form survey were selected by a random sampling program. The data included in these maps are from 100% Short Form survey (A variables) and 10% Long Form survey (L variables). Reference time for the Census is: 00:00AM, November 1, 2010. The 2010 Census covered all 2,872 counties, districts and autonomous regions of Mainland China and includes all persons who hold the nationality of, and have permanent residing place in the People's Republic of China. During the census, each person was enumerated in his/her permanent residing place. The GIS data is based on the national digital map (1:1 million) developed by the National Geographic Information Center of China (NGCC), including rives, roads, residential area and administrative boundaries. This layer is part of the China 2010 county population census dataset. The 2010 China county maps are developed for matching 2010 China population Census data, which should only be used as references for research or education instead of used as official maps. China Data Center. University of Michigan. (2010). China County Map with 2010 Population Census Comparation Data from Long Form Data. Copyright by All China Marketing Research Co., Ltd. Available at: http://purl.stanford.edu/zb352pb5096. Reference time for the Census is: 00:00AM, November 1, 2010. The Census covered all persons who hold the nationality of, and have permanent residing place in the People's Republic of China. During the census, each person was enumerated in his/her permanent residing place. The following persons should be enumerated in their permanent residing place: a) Those who reside in the townships, towns and street communities and have their permanent household registration there. b) Those who have resided in the townships, towns and street communities for more than 6 months but the places of their permanent household registration are elsewhere. c) Those who have resided in the townships, towns and street communities for less than 6 months but have been away from the place of their permanent household registration for more than 6 months. d) Those who live in the townships, towns and street communities during the population census while the places of their household registration have not yet settled. e) Those who used to live in the townships, towns and street communities but are working or studying abroad during the census and have no Permanent household registration for the time being. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.