Manchester United FC in England has the most fans in the world with 330 million followers in the world. The most widely supported football club is Sport Lisboa e Benfica, Portugal, which has 160,398 paid-up members. The record was acknowledged on 9 November 2006 during the celebrations for Guinness World Records Day. The team, better known as just Benfica or, by fans, SLB, has supporters in most municipalities of Portugal and in cities throughout the world, namely Andorra, Angola, Australia, Belgium, Brazil, Canada, Cape Verde, England, France, Germany, Guinea-Bissau, Luxembourg, Macao, South Africa, Switzerland, and the United States.
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The most loyal fans I have seen have got to be Tottenham Hotspur's or Portsmouth because each team has been through a lot and everyone has backed them.