Reddit user atrubetskoy created a map showing just how important cities are to the American economy. Atrubetskoy took gross metropolitan product data — the total of economic activity in a metropolitan area, and the equivalent of gross domestic product for cities — and noted that the top 23 cities have GMPs that add up to about to half of overall United States GDP.

Yikes.

Some places just aren't pulling their weight! lol  To be fair, it probably correlates pretty well with population ;)

110 million people in the orange areas, 200 million in the blue:

http://pandawhale.com/post/37904/where-the-gdp-of-the-usa-is-produced

MSAGMP

New York-Newark-Jersey City, NY-NJ-PA1358416

Los Angeles-Long Beach-Anaheim, CA765759

Chicago-Naperville-Elgin, IL-IN-WI571008

Houston-The Woodlands-Sugar Land, TX449439

Washington-Arlington-Alexandria, DC-VA-MD-WV448741

Dallas-Fort Worth-Arlington, TX420340

Philadelphia-Camden-Wilmington, PA-NJ-DE-MD364009

San Francisco-Oakland-Hayward, CA360395

Boston-Cambridge-Newton, MA-NH336232

Atlanta-Sandy Springs-Roswell, GA294589

Miami-Fort Lauderdale-West Palm Beach, FL274105

Seattle-Tacoma-Bellevue, WA258819

Minneapolis-St. Paul-Bloomington, MN-WI220167

Detroit-Warren-Dearborn, MI208379

Phoenix-Mesa-Scottsdale, AZ201653

San Diego-Carlsbad, CA177410

San Jose-Sunnyvale-Santa Clara, CA173908

Denver-Aurora-Lakewood, CO167886

Baltimore-Columbia-Towson, MD157260

Portland-Vancouver-Hillsboro, OR-WA146975

Charlotte-Concord-Gastonia, NC-SC137189

St. Louis, MO-IL136677

Pittsburgh, PA123577

1,477,472 for all of California