Well, I didn't want to wait too long, so as promised:
Riemann, pop 106,000
Norbury, pop 108,000
In Norbury, the environmentalists have a lot of sway, so the trees get a lot of protection and the city ended up kind of splotchy. Riemann somehow balanced pretty well... and by somehow, I mean an abundant use of "make historic". So, them's the towns.
Details: handcrafted terrain + no cheats. SC4 Rush Hour, CPT tree mod, NAM, CAM (with excess C/I demand removed). Terrain mod too (there are snowcapped parts of region).