The Premier League is the most watched football league in the world

"Across the globe the Barclays Premier League continues to be the most watched football league in the world.
The Premier League is broadcast in 212 territories around the world, working with 80 different broadcasters.
The TV audience for Premier League games is 4.7bn, and the number of homes reached last season increased 11 per cent to 643m. In total, the League clocked up 185,000 hours of TV coverage in 2010/11, an increase of 65 per cent on the previous campaign."

Source:  The Premier League website, retrieved 29th May 2014

Note 1 - Figures seem to be for 2010/11 season

Note 2 - I'm assuming reach figures are for audience and households who have access to at least one game per season, not who actually watch.