After being number one the past three years, the Real Madrid soccer team was passed by the Dallas Cowboys.
During the 2015-16 season, Forbes claims that United generated $765 million.
The NFL's Los Angeles Rams were the biggest gainer, moving from outside the top 50 to 12th as their value doubled to $2.9 billion with their relocation from St Louis to Los Angeles past year, the $2.6 billion bill for the new stadium being footed by owner Stanley Kroenke. Alongside Adidas, the club are sponsored by other big companies such as Chevrolet and 20th Century Fox.
The latest rankings of the 50 most valuable franchises is out from Forbes Magazine and, once again, the Kansas City Chiefs are listed with a value of $1.88 billion. Spanish rivals Barcelona drop down 1 place from third to fourth whilst Real Madrid dropped 3 places to fifth.
No NHL or F1 teams made the top 50.
In Forbes' separate database of the world's billionaires, Ravens owner Steve Bisciotti was ranked the 474th richest man in the world with a net worth of $3.8 billion, an increase of $700 million from last year's valuation that ranked him 569th.
The Los Angeles Rams (formerly of St. Louis) made the list at No. 12 overall, and valued at $2.9 billion.
58% of the list is taken up by National Football League teams.
The Chiefs enjoyed an overall value increase, per Forbes, of 23 percent over the previous year.