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by D-Coder 3099 days ago
Prof. Sidney Culbert of the University of Washington estimated 1 million to 2 million fluent Esperanto speakers about a decade ago. He is the only person I've heard of who has done actual research (he produced the number-of-speakers figures for some 100 languages for the World Almanac). Some methodology at http://www.panix.com/~dwolff/docs/culbert-methods.html.