According to the Bureau of Economic Analysis data, only 31 U.S. counties made up about 33 percent of U.S. Gross Domestic Product. GDP concentration in the U.S. 81 counties produced 50 percent of the nation’s GDP.
The U.S. economy is becoming progressively concentrated in large cities, mainly located on the coasts. For Example, Los Angeles County has a GDP equivalent to Saudi Arabia. The economy of the State of New York is shown in its GDP of $1.7 trillion (2018). If New York State were a sovereign country, it would rank as the world’s 10th largest economy.
The map below shows 10 largest US Metro Areas by GDP.