File official-data.rar includes population data of second level administrative units, from offficial data sources, for Mexico (municipalities), Spain (provinces) and US (counties). It also includes population data for primary and secondary level administrative divisions and major cities for China and India.
File sau-data.rar includes population data for second level administrative units for 150 countries and territories. Data source is the Statoids data base, taken from statoids.com.
File world-population.rar includes population for countries territories from the UN and the World Bank.