Where can I get data for population analytics?

Question

Database

We need data on the population of
St. Petersburg and the Leningrad
Region. Is it possible to find open sources somewhere in the form of a map with the number / density of the population or population census data for further processing

Answer 1

The population of Russia, federal districts, ... , 2010.

Answer 2

if you want to search for public data, then you need to google or yandex