Have you ever wondered how many species of hummingbirds exist? The exact answer to this question will depend on which reference source you consult, but I have read that there are between 330-340 different species of hummingbirds found in the world. In the United States there are 17 different species of hummingbirds found here. That number represents 5 percent of the hummingbird population. Costa Rica has 55 different species of hummingbirds. These numbers may change depending on whether or not the species is facing extenction or if a new species of hummingbird should be discovered in the future. Lastly, it may suprise you to discover that are absolutely no species of hummingbirds found in Hawaii.