Where can I find the population size for each geographical unit in GEOLEV1 and GEOLEV2?

INTERNATIONAL
1

I would like to compare geographical units of approximately the same size. I could not find details on unit size - in terms of square miles and population - for each of the geographical units in those variables (and all ENUTS variables as well).

2

This is probably what you are looking for - https://terra.ipums.org/home.

Shouro