Rye Brook, NY. Online Offers. Rye Brook is a village in Westchester County, New York, United States within in the Town of Rye. Prior to the village's establishment on July 7, 1982, the area was an unincorporated section of the Town of Rye. The population was 8,602 according to the 2000 census. Rye Brook has been designated as a Tree City USA for 14 years. Rye Brook, NY is located at 41°1′11″N 73°41′0″W / 41.01972°N 73.683333°W / 41.01972; -73.683333 (41.019767, -73.683419).