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			Thanks to Mr. Wiki, here is a list of US convention centers that have at least 500,000 square feet of exhibition space.
 The first number for each convention center below is the total exhibition space in square footage, while the second number is its overall square footage.  Note that Atlantic City is at the bottom of the list with exactly 500,000 square feet of exhibition space...that's where I drew a line in the convention sand.  I do not have the contiguous square footage for each place, but if Atlantic City is currently in the mix, then the National organizers are obviously willing to accept under 600,000 sq. ft. of contiguous space.
 
 
 McCormick Place	Chicago	2,670,000 sq ft /9,000,000 sq ft
 
 Las Vegas Convention Center   Las Vegas	2,500,000 sq ft /4,600,000 sq ft
 
 Orange County Convention Center	Orlando  2,100,000 sq ft/ 7,000,000 sq ft
 
 Georgia World Congress Center	Atlanta	1,500,000 sq ft/	3,900,000 sq ft
 
 New Orleans Morial Convention Center	  New Orleans	1,100,000 sq ft/ 3,100,000 sq ft
 
 World Equestrian Center	Ocala, Florida	1,026,500 sq ft /1,036,100 sq ft
 
 International Exposition Center (I-X Center)	Cleveland	1,000,000 sq ft/ 2,200,000 sq ft
 
 Kay Bailey Hutchison Convention Center	Dallas	1,000,000 sq ft/	2,000,000 sq ft
 
 Pennsylvania Convention Center	  Philadelphia	1,000,000 sq ft /2,000,000 sq ft
 
 Sands Expo and Convention Center	Las Vegas	936,600 sq ft/2,250,000 sq ft
 
 Mandalay Bay Convention Center 	Las Vegas	861,231 sq ft /2,100,000 sq ft
 
 George R. Brown Convention Center	Houston	853,000 sq ft/1,800,000 sq ft
 
 Jacob K. Javits Convention Center	New York City	850,000 sq ft/ 3,300,000 sq ft
 
 Donald E. Stephens Convention Center	Rosemont, Illinois	840,000 sq ft /1,000,000 sq ft
 
 Anaheim Convention Center	Anaheim	815,000 sq ft /1,600,000 sq ft
 
 Cleveland Convention Center and Global Center for Health Innovation	Cleveland	767,000 sq ft/1,002,000 sq ft
 
 Georgia National Fairgrounds and Agricenter	Perry, Georgia	738,204 sq ft/781,831 sq ft
 
 Huntington Place	Detroit	723,500 sq ft /2,400,000 sq ft
 
 Los Angeles Convention Center	Los Angeles	720,000 sq ft /867,000 sq ft
 
 NRG Center	Houston	706,000 sq ft/1,400,000 sq ft
 
 Walter E. Washington Convention Center	Washington, D.C.	703,000 sq ft/2,300,000 sq ft
 
 Moscone Convention Center	San Francisco	700,000 sq ft/2,000,000 sq ft
 
 San Diego Convention Center	San Diego	615,700 sq ft/2,600,000 sq ft
 
 Pennsylvania Farm Show Complex and Expo Center	Harrisburg, PA	593,872 sq ft/634,507 sq ft
 
 Colorado Convention Center	Denver	584,000 sq ft/2,200,000 sq ft
 
 Indiana Convention Center	Indianapolis	566,600 sq ft /1,300,000 sq ft
 
 America's Center	St. Louis	523,000 sq ft /2,700,000 sq ft
 
 Boston Convention and Exhibition Center	Boston	516,000 sq ft/ 976,000 sq ft
 
 Salt Palace Convention Center	Salt Lake City	515,000 sq ft/ 679,000 sq ft
 
 Henry B. Gonzalez Convention Center	San Antonio	514,000 sq ft/1,500,000 sq ft
 
 Miami Beach Convention Center	Miami Beach	502,000 sq ft/ 1,000,000 sq ft
 
 Atlantic City Convention Center	Atlantic City, New Jersey	500,000 sq ft /1,000,000 sq ft
 
 
 Brian (you can thank me later for removing square meter amounts)
 
			
			
			
			
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