THE U.S EMPIRE

According to the Pentagon's own list PDF, the answer is around 865, but if you include the new bases in Iraq and Afghanistan it is over a thousand. These thousand bases constitute 95 percent of all the military bases any country in the world maintains on any other country's territory.
The old way of doing colonialism, practiced by the Europeans, was to take over entire countries and administer them. But this was clumsy. The United States has pioneered a leaner approach to global empire. As historian Chalmers Johnson says, "America's version of the colony is the military base." The United States, says Johnson, has an "empire of bases."