Here's a list farmed from Mygamercard.net
Country | MGC Userbase | Live Userbase | Console Userbase |
USA | 1,085,826 | 6,215,375 | 10,024,798 |
United Kingdom | 262,391 | 1,501,952 | 2,422,503 |
Canada | 102,506 | 586,754 | 946,378 |
France | 59,303 | 339,456 | 547,510 |
Japan | 55,320 | 316,657 | 510,737 |
Germany | 53,532 | 306,422 | 494,230 |
Netherlands | 32,242 | 184,556 | 297,672 |
Spain | 32,165 | 184,116 | 296,961 |
Austrailia | 30,754 | 176,039 | 283,934 |
Mexico | 28,985 | 165,913 | 267,602 |
Italy | 27,643 | 158,231 | 255,212 |
Sweeden | 16,679 | 95,472 | 153,987 |
Hong Kong | 13,450 | 76,989 | 124,176 |
South Korea | 12,251 | 70,126 | 113,106 |
Norway | 9,919 | 56,777 | 91,576 |
Belgium | 9,384 | 53,715 | 86,637 |
Ireland | 8,597 | 49,210 | 79,371 |
Switzerland | 7,924 | 45,358 | 73,158 |
Taiwan | 7,352 | 42,084 | 67,877 |
Finland | 6,934 | 39,691 | 64,018 |
Denmark | 6,329 | 36,228 | 58,432 |
Austria | 6,160 | 35,260 | 56,872 |
Poland | 5,069 | 29,015 | 46,799 |
New Zealand | 4,632 | 26,514 | 42,765 |
Singapore | 4,278 | 24,488 | 39,496 |
Brazil | 3,759 | 21,517 | 34,705 |
Portugal | 3,542 | 20,275 | 32,701 |
South Africa | 2,594 | 14,848 | 23,949 |
Russia | 2,297 | 13,148 | 21,207 |
Colombia | 1,775 | 10,160 | 16,388 |
Greece | 1,394 | 7,979 | 12,870 |
Hungary | 1,391 | 7,962 | 12,842 |
Chile | 1,330 | 7,613 | 12,279 |
Czech Republic | 1,214 | 6,949 | 11,208 |
India | 746 | 4,270 | 6,887 |
Slovakia | 569 | 3,257 | 5,253 |
Live Userbase = (Country) / 0.1747
Console Userbase = (Country) / 0.62
Therefore, the list doesn't take into consideration non-Live countries, and assumes broadband penetration rates (needed for XBL) are the same from country to country.
Back from the dead, I'm afraid.