[proudpapa]

Portland, Oregon is the largest urban area in the US w/o a major league team.

http://en.wikipedia.org/wiki/Table_of_United_States_Metropolitan_Statistical_Areas

[buccaneer81]

Portland, Oregon is the largest urban area in the US w/o a major league team.

I assume you mean major league baseball.

The largest metro without a major league team in any sport is Riverside, CA.