Disneyland in Anaheim, California, was No. 2 with an estimated 18.3 million visitors, followed by Tokyo Disneyland, which had an estimated 16 million, according to a report from AECOM and the Themed Entertainment Association.

Disney World, Universal Orlando and SeaWorld all saw a jump in attendance in 2015 over the previous year, according to the report.

[Read also: Shanghai Disneyland opening pushes up airfares]

Epcot was sixth in the world in attendance with 11.8 million, a 5 percent increase from 2014. Disney's Animal Kingdom drew 10.8 million, also a 5 percent increase, and Universal Orlando saw the biggest increase, with a 16 percent jump to 9.9 million visitors.

"Last year we said everything was looking good in the Americas and poised for moderate growth — but 2015 blew the roof off moderate," Brian Sands, vice president of economics with AECOM, said in a released statement. "In theme parks, not only did the two top operators, Disney and Universal, both excel, the North American market as a whole did well, too."

[Read also: Lego opens world's largest store at Shanghai Disney]

Disney Hollywood Studios attendance increased to 10.8 million, which was a 5 percent jump, Island of Adventure at Universal had 8.8 visitors, which was an 8 percent improvement and SeaWorld had a 2 percent improvement at nearly 4.8 million visitors in 2015.

Orlando had seven parks make the Top 25 in attendance worldwide, according to the report.

Amusement parks do not release exact attendance figures. The report used a formula to come up with an estimate.

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