Borough Park is a neighborhood in the southwestern part of the borough of Brooklyn, in New York City in the United States; Borough Park covers an extensive grid of streets between Bay Ridge and Prospect Park. Borough Park had its beginnings in a few streets of cottages called "Blythebourne" erected in 1887 by the speculative builder, Electus B. Litchfield. Another developer, William Reynolds, built more speculative housing in the area, which was served by a steam railroad, the Brooklyn, Bath and Coney Island West End Line.
Borough Park is home to one of the largest Orthodox Jewish communities outside of Israel, with one of the largest concentrations of Jews in the United States, and Orthodox traditions rivaling many insular communities. Since the average number of children in Hasidic and Hareidi families is 6.72, Borough Park is experiencing sharp growth. It is an economically diverse area, with rich, working class and poor people living side-by-side and going to the same schools and synagogues.