The Satmars, who may be the largest Hasidic dynasty, have their world headquarters in South Williamsburg. I am convinced that Hasidic Jews are one of the most misunderstood minorities in New York. There is something surreal about walking down the street surrounded by people wearing clothing both extremely uniform and centuries outdated. For many people, their attire alone is alienating.
Many of the neighborhoods physical idiosyncrasies have very specific cultural ramifications. During Sukkot, in late autumn, many Jews (not just Hasidim) build a temporary hut outside to eat meals in throughout the week-long holiday. Thus the abundance of often obviously homemade square balconies that jut out from every apartment.
According to the FAQ at HasidicNews.com, "In general, the Hasidic attitude towards non-Jews is one of contempt and disinterest. Children, especially, are taught how 'bad' and sinful non-Jews are and are constantly taught to refrain from certain behavior merely for the purpose of 'Chillul Hashem' - not to cause a bad reputation, as opposed to it being inherently unbecoming." This may explain why they have their own hospitals, schools, even city buses (to other Hasidic neighborhoods!).
Another noticeable particularity of the Brooklyn Hasidim is their strong preference for minivans. Following a biblical mandate to "be fruitful and multiply," the average Hasidic family in the US has 7.9 children. The Satmars have expanded beyond Williamsburg to their own suburban enclave upstate in Kiryas Joel, Orange County. Since the town is overwhelmingly populated with Satmars, on top of being developed by them, it's a perfect microcosm for their demographic as a whole. Coupling the extremely high birth rate with young arranged marriages, Kiryas Joel has the youngest median age of any American town over 5000, and the forth lowest per capita income of any American town over 3000.
What fascinates me most is how such an insular old-fashioned group of people, who don't watch television, who won't allow women to drive, who don't mix with outsiders and dress like it's 19th century Lithuania can live for generations in the middle of modern New York City. With such a strict lifestyle and a distaste for excess, how would it feel to walk by a thumping nightclub and see scantily clad women? How could you be so xenophobic and then share your neighborhood with Jamaicans and Dominicans and ride packed subway trains to work? Most born-again's wouldn't be caught dead in any city, but for whatever reason, Hasidic Jews have made Brooklyn their home.