Comment by rrr_oh_man

Nope, and it didn't matter.

You need to know military, not population size (how quickly can a militia be raised, how long can it be sustained, how well they are armed, who can be persuaded to defect, etc.). This is related to population size, but not linearly.

Population counts get only interesting for military and tax potential during administration of a territory.

GP's point is valid, though, imho.