As of September 14th, here is a list of this season's attendance figures. (Stadium Capacity/Soccer Specific Stadiums)
Total Attendance Average (Capacity)
1 Los Angeles 336,762 25,904 (27,000)
2 Toronto FC 263,255 20,250 (20,000)
3 DC United 252,714 19,439 (*)
4 Chicago 207,103 17,258 (21,000)
5 Houston 193,864 16,155 (32,000)
6 New York Red Bulls 191,828 15,985 (*)
7 Real Salt Lake 204,983 15,767 (*)
8 Chivas USA 180,342 15,028 (27,000)
9 San Jose 175,238 14,603 (*)
10 New England 158,969 14,451 (*)
11 Columbus 177,056 13,619 (22,600)
12 Dallas 163,100 13,591 (21,000)
13 Colorado 176,571 13,582 (18,500)
14 Kansas City 130,670 10,889 (*)
* - New stadium under construction.
Stadiums Under Construction:Real Salt Lake Stadium - 20,000/2008
Red Bull Arena - 25,000/2009
Chester Stadium - 18,500/2010 (New Philadelphia Franchise)
Stadiums Under Proposal:Poplar Point Stadium - 27,000 (DC United)
en.wikipedia.org/wiki/Poplar_Point_StadiumEarthquake Stadium - 18,000 (San Jose Earthquakes)
en.wikipedia.org/wiki/New_Earthquakes_StadiumDynamo Stadium - 20,000 (Houston Dynamo)
en.wikipedia.org/wiki/New_Houston_Dynamo_stadiumWizard Stadium - 18,500 (Kansas City Wizards
en.wikipedia.org/wiki/New_Kansas_City_Wizards_stadium