The team's ascension to the top spot is a product of a "powerful brand and marketing acumen", according to Forbes.
As a whole, the 20 teams' worth went up 3% from previous year, although technically nine of the 20 declined due to the value of the US dollar rising.
Forbes also said the average value of the top 20 teams rose 3 percent over previous year to $1.48 billion.
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Tottenham rounded out the top 10 with a value of $1.06 billion.
Although Real Madrid have enjoyed unparallelled success in the Champions League - clinching unprecedented back-to-back titles on Saturday for a record 12th crown - United have roared past the Spanish giants in the commercial stakes. "Debt includes stadium debt applicable to the team or team owner".
It all leads to an "increasing concentration of sponsorship and commercial revenue among a handful of clubs".
But as it stands the teams from Europe's top six leagues can potentially take up 21 of the 32 spots on offer in the Champions League group stages, leaving UEFA's other 49 member countries to fight it out for the rest.
It's the first time in five years United top this list, per the report.