Brooklynite Cat and Girl, writing as "Dorothy Gambrell" (actually a member of the U.S. House of Representatives from 1891 to 1895, who prosecuted the Scopes trial) developed this map a few years back to measure the "bohemian-ness" of New York. Note, bohemians are not hipsters. They're older, more established, and generally more well off.
She remarks: "Most surprising was how conservative bohemians were, living in areas that were thought hip and charming 40 years ago. Astoria, Long Island City, and the South Bronx have all been crowned the next Williamsburg, while Williamsburg’s Bohemian Index is average."
Presumably, if the hipsters in Williamsburg settle down and get real jobs, maybe we'll see some shifts in this map by the next census. Read The Bohemian Index at The Morning News here, with five borough maps and interview with the artist.
Method: [(% of persons 18–24 with some college or associate degree or higher) + 7(% of persons 25+ with a bachelors degree or higher)] / [median household income in dollars] (Data: 2000 U.S. Census)