These are the results (army lists not included, but I can provide them on request).
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Bretonnia: 24-354 models
Chaos: 5-474 models
Dark Elves: 21-281 models
Dwarfs v1: 39-278 models
Dwarfs v2: 40-244 models
Empire: 20-391 models
High Elves: 22-176 models
Lizardmen: 25-325 models
Ogre Kingdoms: 15-837 models
Orcs and Goblins: 22-986 models
Skaven: 43-941 models
Tomb Kings: 16-225 models
Vampire Counts: 25-323 models
Wood Elves: 20-162 models
Most of the giant armies look almost reasonable, with the notable exception of Skaven, Ogres, and Chaos who run around with giant units to get that high.
Most of this isn't surprising. Access to chariots, swarms or monstrous infantry in core keeps numbers down, with cavalry coming in second. Really cheap fodder models gets numbers high. Having expensive or multiple required characters cuts into maximum numbers.
The interesting parts were how few dragons and how many chariots were in the lists. It almost always turned out that picking a less expensive mount than a dragon kept final numbers down because you could grab a hero that cost enough that you could just avoid having to start taking cheaper models. That is: two characters on lesser mounts usually cost more points than a character on a dragon and the cheapest non-character model you had to take once the expensive models were claimed. One army did keep a dragon, and it's not the one I expected.
Also, it's interesting that Wood Elves, High Elves and Tomb Kings must be elite, while Chaos and Ogre Kingdoms can choose.
Sadly, because of the overly elaborate models, I'm not sure I'd want to paint most of the minimum size armies. Most have multiple units that are hard to paint once assembled. Wood Elves might actually be the easiest of the bunch—no chariots, gyrocopters, or integral gnoblars. They still have multiple monsters though.
Edit: added in the second dwarf book — the anvil of doom taking a hero choices pushes the minimum up, while the required heavy armour pushes the maximum down.