“There are only about four hundred people in New York society.”
Interview with Charles H. Crandall in ‘New York Tribune’, 1888, in ‘Dictionary of American Biography’ vol. 11 (1933)
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Related quotes

“There are two million interesting people in New York and only seventy-eight in Los Angeles.”
Interviewed in Playboy (February 1979)

When the Cathedrals Were White http://books.google.com/books?id=TzwVAAAAMAAJ&q="A+hundred+times+I+have+thought+New+York+is+a+catastrophe+and+fifty+times+it+is+a+beautiful+catastrophe"#search_anchor (1947)
Attributed from posthumous publications

Online text Inheritor of Tarnished Presidency: Itamar Augusto Cantiero Franco http://www.nytimes.com/1992/12/30/world/man-in-the-news-inheritor-of-tarnished-presidency-itamar-augusto-cantiero-franco.html (December 30, 1992)

Greenwich Village as It Is, in Pearson’s Magazine (October 1916)

On African American women being the “first” in their given fields in “Q&A with Veronica Chambers, author of ‘The Meaning of Michelle’” https://www.stanforddaily.com/2017/02/06/qa-with-veronica-chambers-author-of-the-meaning-of-michelle/ in The Stanford Daily (2017 Feb 6)