Areas and locations in the United States where Orthodox Jews live in significant communities. These are areas that have within them an Orthodox Jewish community in which there is a sizable and cohesive population, which has its own eruvs, community organizations, businesses, day schools, yeshivas, and/or synagogues that serve the members of the local Orthodox community who may at times be the majority of the population.
An appearance on this list does not mean that the place listed is inhabited entirely by Orthodox Jews, nor that Orthodox Jews constitute the majority of the population of the place listed. While some of the communities listed are nearly entirely Orthodox, most are cohesive Orthodox communities that exist within a larger, non-Orthodox community. In many cases, there are other cohesive communities within the same area comprising other religious and/or ethnic groups.
The majority of Orthodox Jews in the United States live in the Northeast U.S. (particularly New York and New Jersey), but many other communities in the United States have Orthodox Jewish populations. This list includes Haredi, Hasidic, Modern Orthodox, and Sephardic Orthodox communities. The list does not include every location in the United States that contains a Chabad house, as the main purpose of these synagogues is to reach out to non-Orthodox populations.
With the largest Jewish population outside Israel, approximately one-third of all Jews in New York are now Orthodox Jews.