Warlock,
In the Birthright rulebook, pages 33 & 34 has population info.

Basically, provinces are 1,000 to 1,500 square miles, 30 to 40 miles
square.

Level 0, wild, unsettled, less than 1,000 people

Level 1 to 3, thinly settled, main towns under 1,000, total 2,000 to
10,000

Level 4 to 6 10,000 to 40,000 people towns up to 5,000

Level7+, may get over 100,000

A bit more is in the last two pages (95 and 96) on domain design.


These populations approach historic medieval European densities much
closer than most ... most FRP settings are grossly underpopulated
relative to earthly societies at that technology level.

Lyndon