MLB Cities and Median Houshold Income

City                                 Population                                      Median

                                                                                             Household 

                                                                                             Income

New York                        8,391,000                                    $50,000

Los Angeles                      3,831,000                                    $48,600

Chicago                            2,851,000                                    $45,700

Houston                            2,257,000                                    $42,900

Phoenix                             1,593,000                                    $47,000

Philadelphia                       1,547,000                                    $37,000

San Diego                         1,306,000                                    $59,900

Dallas                                1,299,000                                    $39,800

Detroit                                 910,000                                     $26,000

Minneapolis/ St Paul            666,000                                      $45,500

St Louis                              356,000                                      $34,800

San Francisco                      815,000                                      $70,700

Boston                                645,000                                      $55,900

Baltimore                            637,000                                      $38,700

Seattle                                616,000                                      $60,800

Denver                               610,000                                      $46,400

Milwaukee                         605,000                                      $34,800

Washington, DC                 599,000                                      $59,200

Atlanta                               540,000                                      $49,900

Kansas City                        482,000                                      $42,000

Miami                                433,000                                      $28,900

Cleveland                           431,000                                      $24,600

Oakland                             409,000                                      $51,400

Tampa / St Petersburg        587,000                                      $41,600

Cincinnati                           333,000                                      $32,700

Pittsburgh                           311,000                                      $37,000

Aneheim                            387,000                                       $55,100
Toronto                           2,503,000                                      $59,000

I thought this might make looking at the difference in the small market teams and the large market teams a little easier. 

Also keep in mind the household income numbers are for the median income not the average.
Information here was found at  www.city-data.com