It's obviously an American article with an American slant, but the game is popular in the Pacific North West. Seattle get 40,000 a game, and Portland would too if they had a stadium big enough - they have 16,000 season ticket holders with another 14,000 on the waiting list. This is footage...
From an American angle:
http://www.buzzfeed.com/austinhunt/21-soccer-stadiums-you-should-watch-a-game-in-before-you-die
You'll have to excuse the obvious two mistakes - Fratton Park featuring the "best fans in the world" isn't on the list, and nor is Selhurst Park, home to the "best fans in...