The United Nations Statistics Division collects, compiles and disseminates data from national statistical offices on population density and urbanization through the Demographic Yearbook data collection system.
A number of tables presented in the Demographic Yearbook provide disaggregated statistics by urban and rural breakdown. In addition, data on population of capital cities and cities of 100,000 and more inhabitants are also available.
The United Nations Population Division uses these data as input for estimating urbanization and are available via World Urbanization Prospects.
Standards and methods including handbooks, guidelines, and training manuals are available online.
Freely available data on internet.