China Historical Geographic Information System http://www.fas.harvard.edu/~chgis/
The China Historical Geographic Information System, CHGIS, project was launched in January 2001 to establish a database of populated places and historical administrative units for the period of Chinese history between 222 BCE and 1911 CE. CHGIS provides a base GIS platform for researchers to use in spatial analysis, temporal statistical modeling, and representation of selected historical units as digital maps.
The Columbia Gazetteer of the World [electronic resource] / Saul B. Cohen, editor. [New York] : Columbia University Press, c2001- This resource lists all county seats (mostly using Chinese names) as well as population and local products. http://www.columbia.edu/cgi-bin/cul/resolve?ATS5257
http://www.plateauperspectives.org/province.htm political maps of Qinghai down to the xian/county (Chinese only)
THDL Gazetteer http://www.thdl.org/collections/cultgeo/gazetteer/ Only Central Tibet.
Tibet Map Institute http://www.tibetmap.com/brtext.html "Tibet Administrative Maps"
Tibetan Buddhist Resource Center (place search) http://www.tbrc.org/index.xq
Tibet Outside the TAR. CD-Rom, available for purchase from the International Campaign for Tibet. Features scans with clear borders of Chinese maps of Tibetan prefectures. List of Tibetan administrative seats outside the TAR giving Tibetan and Chinese spellings (and characters). pp. 2433-2450.