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My recent experiences with conventions have me rather curious about the size of the convention centers, and a google search left me without a definitive list of venues.

The top 10 in the U.S.:

1. McCormick Place, Chicago, Illinois, 2.2 million square feet
   
2. Orange County Convention Center, Orlando Florida, 2.05 million square feet
   
3. Las Vegas Convention Center, Las Vegas, 1.94 million square feet
   
4. Georgia World Congress Center, Atlanta, Georgia, 1.37 million square feet
   
5. Kentucky Exposition Center, Louisville, Kentucky, 1.29 million square feet
   
6. Sands Expo and Center, Las Vegas, Nevada, 1.13 million square feet
   
7. Ernest N. Morial Convention Center, New Orleans, Louisianna 1.1 million square feet
   
8. Dallas Convention Center, Dallas, Texas, 1.02 million square feet
   
9. Pennsylvania Farm Show Complex and Expo Center, Harrisburg, Pennslyvania, 1 million square feet
   
10. George R. Brown Convention Center, Houston, Texas, 930,000 square feet
    

California Convention Centers:

• Anaheim Convention Center, Anaheim, California, 813,607 square feet
  
• Los Angeles Convention Center, Los Angeles, California, 720,000 square feet
  
• Moscone Center, San Francisco, California, 538,000 square feet
  
• San Diego Convention Center, San Diego, California, 525,701 square feet
  
• Long Beach Convention Center, Long Beach, California, 224,000 square feet
  
• San Jose McEnery Convention Center, San Jose, California, 143,000 square feet