Futebol Finance based their analysis on attendances last season, and with an average Old Trafford attendance of 75,304 last season, United surpassed Real Madrid, the 2009-2009 winners.
What is surprising is the lack of Premier League sides on the list. Just United and Arsenal (Newcastle were in the Championship).
20 Best Supported Clubs in Europe (2009-2010 season)
1. Manchester United, England: 75,304 average
2. Borussia Dortmund, Germany: 74,748
3. Barcelona, Spain: 71,045
4. Real Madrid, Spain: 70,816
5. Bayern Munich, Germany: 69,000
6. Schalke, Germany: 61,442
7. Arsenal, England: 60,040
8. AC Milan, Italy: 59,757
9. Celtic, Scotland: 57,366
10. Hamburg, Germany: 54,811
11. Hertha Berlin, Germany: 52,165
12. Marseille, France: 52,162
13. Inter Milan, Italy: 52,520
14. Stuttgart, Germany: 51,700
15. Cologne, Germany: 50,222
16. Rangers, Scotland: 49,534
17. Ajax, Holland: 49,014
18. Newcastle United, England: 48,750
19. Borussia Moenchengladbach, Germany: 47,240
20. Eintracht Franckfurt, Germany: 47,000
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