28,548 – Seattle Sounders – Qwest Field

15,895 – DC United – RFK Memorial Stadium 
14,686 – Columbus Crew – Columbus Crew Stadium 
12,462 – New York Red Bulls – Giants Stadium 
11,885 – Colorodao Rapids – Dick’s Sporting Goods Park
9,177   – San Jose Earthquakes – Buck Shaw Stadium
6,524   – FC Dallas – Pizza Hut Park

Nice work Sounders fans.