This would be a difficult question to answer because what we see in-game is kind of a simplified representation of how Tamriel actually is in the lore. Cities that have 10 houses and 15 NPCs are supposed to be waaaay bigger and have more people in-universe, that just can't be realistically represented in the games. Censuses and demographic information don't seem to be something lore texts really touch on.

That being said, we can get some rough estimates on how many NPCs are actually included in the game by looking at UESP's race categories and counting the number of articles per category. That gives us:

1,867 Argonians
3,047 Bretons
2,831 Dark Elves
2,318 High Elves
1,481 Imperials
2,299 Khajiit
2,247 Nords
1,756 Orcs
492 Reachfolk
2,243 Redguards
1,859 Wood Elves

Of course these are not entirely accurate counts because some of these are pages for generic unnamed enemy types, and of course the entirety of Tamriel is not included in the game so this only reflects the zones that are currently present. But it's a pretty accurate look at the distribution of NPCs currently in the game!

As for the question 'where do Imperials live' - mostly Cyrodiil, even after the Soulburst. Most of Colovia and Southern Nibenay are distant enough from the conflict of the Alliance War that life goes on there as usual. Even in the more war-torn parts of Cyrodiil, the Imperials are still inhabiting most towns and trying to live their lives. There are a lot of colonial towns from the Reman era (such as Southpoint or Arenthia in Valenwood) that have higher than average Imperial populations too.

adirondack wrote: »

What is the weight of an unladen swallow?

What is the capital of Assyria ?

Too many Red Guard. It's time to cull some of them.
For Betony!! ATTACK!!!

Dwemer - 0

(or are they coming back????)

Zama666 wrote: »

Are there any demographics for Tamriel and surrounding areas?
What is the birth rate of Nords?

Just to speak on these two; it would be near impossible to have an accurate guess--or one that would be accurate for any period of time. Population and demographics of IRL history were always very... chaotic; one famine would cause a massive pop fall, and multiple good harvests and years of weather would be required to fix it.

Of course, Tamriel isn't IRL, and they aren't 1:1 at all, but the worldbuilding is still fairly naturalistic, so it would be very surprising if similar rules and scenarios didn't apply, especially given what we've seen of most of the settlements in main games and ESO.