USTOA revealed the result of the survey made of its active members at its annual conference in Hawaii in early December.
Myanmar topped the list, while India was in third place followed by Peru and Cambodia.
Founded in 1972, USTOA is a professional association representing some of the top names in travel and tourism and accounting for a sizeable portion of the tour operators' market in North America.
In 2012, it voted for Vietnam as the top emerging destination in 2012, followed by India, Ecuador, and China.
Vietnam attracted more than 6.6 million tourists in 2012, 9.5 percent more than 2011, according to the General Statistics Office.
Thanh Nien News