Eastchester, New York, United States [CDP]; population was 18,537 in 1990; housing units was 7,884 in 1990; location is 40°57'N 73°48'W; land area is 3.34 square miles (2,140 acres); water area is 0.10 square miles (61 acres); FIPS code is 21809 [SourceCBP]