Flatbush, a town of Kings co., New York, bordering on Brooklyn; pop. in 1850, 2,977; in 1860, 3,471; in 1870, 6,309. It is the seat of the almshouse, hospital, lunatic asylum, and nursery of the county, and contains Dutch Reformed, Episcopal, Methodist, and Roman Catholic churches. Erasmus Hall academy in 1871 had 9 instructors, 121 students, and a library of 2,738 volumes. The town has been much improved within a few years, and numbers among its residents many business men of Brooklyn and New York. The battle of Long Island (August, 1776) was fought here.