Here's what we know:
* The Esperanto Association of North America (EANA) claims over 10,000 members, but this number includes Canada and likely doesn't represent all speakers in the region.
* Other estimates range from a few thousand to tens of thousands based on language learning resources and online communities.
* Esperanto is considered to be a "minority language" in the United States, meaning it has a relatively small number of speakers compared to other languages.
Overall, it's safe to say that Esperanto has a modest presence in the United States, with a few thousand to tens of thousands of speakers.