The United States contains 1/3 of the world’s airports, the most of any country in the world, according to World Atlas. All 50 states and administrative territories have at least one airport, and there are almost 20,000 airports in the U.S. with over 5,000 open for public use. 
Some of the airports in the U.S. are also among the busiest and biggest airports in the world. With nearly three million passengers flying in and out of U.S. airports everyday, you may wonder what the busiest airport in the U.S. is. If so, we have the answers for you. 
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According to World Atlas, the busiest airport in the United States by passenger traffic is Hartsfield–Jackson Atlanta International Airport (ATL). ATL had over 100 million passengers travel through it in the pre-COVID year of 2019, 20 million more than the second-busiest airport in the U.S. 
Named after two former mayors of Atlanta, Maynard Jackson and William Hartsfield, it is located almost seven miles outside of the city and occupies seven square miles of land. It serves as an international gateway to the United States and is the hub for Delta Airlines, according to World Atlas.
According to World Atlas, the following are the busiest airports in the U.S., based on 2019 pre-COVID numbers: 
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According to World Atlas, ATL is also the busiest airport in the world. The following are the 10 busiest airports in the world based on 2019 pre-COVID numbers: 
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