Britt posted some interesting numbers over on the Powerfest forum regarding band popularity as measured by My Space numbers. Obviously, this is a world wide picture instead of a region, but it should give you an idea nonetheless. It may surprise a few of you:
Nightwish 4,591,508
Lacuna Coil 3,143,710
Megadeth 2,260,311
Iron Maiden 2,167,228
Dream Theater 1,558,958
Amon Amarth 772,978
Queensryche 584,130
Kamelot 486,785
Nile 470,882
Blind Guardian 412,639
Sonata Arctica 401,698
Kataklysm 382,740
Nevermore 377,441
Symphony X 326,722
Firewind 229,870
Moonspell 220,285
Amorphis 190,526
Satyricon 187,678
Iced Earth 163,156
Turisas 160,477
Volbeat 151,872
Stratovarius 145,115
Riverside 109,409
Trouble 107,001
Elvenking 83,481
Candlemass 75,257
Nocturnal Rites 72,742
Novembers Doom 71,861
Pagan's Mind 71,031
Primordial 70,877
Threshold 60,949
Angra 49,332
Mystic Prophecy 28,755
Vanden Plas 23,193
Wolverine 21,496
Brainstorm 21,492
Nightwish 4,591,508
Lacuna Coil 3,143,710
Megadeth 2,260,311
Iron Maiden 2,167,228
Dream Theater 1,558,958
Amon Amarth 772,978
Queensryche 584,130
Kamelot 486,785
Nile 470,882
Blind Guardian 412,639
Sonata Arctica 401,698
Kataklysm 382,740
Nevermore 377,441
Symphony X 326,722
Firewind 229,870
Moonspell 220,285
Amorphis 190,526
Satyricon 187,678
Iced Earth 163,156
Turisas 160,477
Volbeat 151,872
Stratovarius 145,115
Riverside 109,409
Trouble 107,001
Elvenking 83,481
Candlemass 75,257
Nocturnal Rites 72,742
Novembers Doom 71,861
Pagan's Mind 71,031
Primordial 70,877
Threshold 60,949
Angra 49,332
Mystic Prophecy 28,755
Vanden Plas 23,193
Wolverine 21,496
Brainstorm 21,492