According to Forbes' list, Dallas Cowboys are the first non-soccer club to lead all clubs and teams since Forbes began compiling its top 50 in 2011, with Manchester United (2011-2012) and Real Madrid (2013-2015) holding the No. 1 spot in recent years.

 
Forbes' Most Valuable Sports Franchises: Top 10
RankTeamLeagueWorth
1Dallas CowboysNFL$4 billion
2Real MadridLa Liga$3.65 billion
3BarcelonaLa Liga$3.55 billion
4New York YankeesMLB$3.4 billion
5Manchester UnitedEPL$3.32 billion
6New England PatriotsNFL$3.2 billion
7New York KnicksNBA$3 billion
8WashingtonNFL$2.85 billion
9New York GiantsNFL$2.8 billion
10Los Angeles LakersNBA$2.7 billion
The NFL’s most valuable teams:

1. Dallas Cowboys: $4 billion
2. New England Patriots, $3.2 billion
3. Washington Redskins, $2.85 billion
4. New York Giants, $2.8 billion
5. San Francisco 49ers, $2.7 billion

Soccer’s most valuable teams:

1. Real Madrid: $3.65 billion
2. Barcelona, $3.55 billion
3. Manchester United, $3.32 billion
4. Bayern Munich, $2.68 billion
5. Arsenal, $2.02 billion

The NBA’s most valuable teams:

1. New York Knicks: $3 billion
2. Los Angeles Lakers, $2.7 billion
3. Chicago Bulls, $2.3 billion
4. Boston Celtics, $2.1 billion
5. Los Angeles Clippers, $2 billion

MLB’s most valuable teams:

1. New York Yankees: $3.4 billion
2. Los Angeles Lakers, $2.5 billion
3. Boston Red Sox, $2.3 billion
4. San Francisco Giants, $2.25 billion
5. Chicago Cubs, $2.2 billion

Source: Forbes