Major League Soccer (MLS) - Current MLS soccer-specific stadiums capacities

Reference 1: Capacity.

Reference 2: Avaya Stadium, BBVA Compass Stadium, Children's Mercy Park, Dick's Sporting Goods Park, Mapfre Stadium, Orlando City Stadium, Providence Park, Red Bull Arena, Rio Tinto Stadium, Saputo Stadium, StubHub Center, Talen Energy Stadium, Toyota Park and Toyota Stadium.

Source: http://en.wikipedia.org/wiki/Soccer-specific_stadium