Divided by races of demihumans, mostly:County = Gnomes/HalflingsDuchy = ElvesPrincipality = Dwarves
Same with Urnst?
No, Urnst is purely political. Both were formerly controlled by Nyrond, now independent, they still give troops to aid the Nyrondese versus the Great Kingdom.The Duchy has more wealth and influence than the County, which itself is under the Duchy's protection, but not subservient.
Kind of like Virginia and West Virginia!
The Urnsts were provinces of Nyrond, the Uleks were provinces of Keoland, as were the duchy of geoff, earldom of sterich, sea princes, etc.