Farmingville is a hamlet and census-designated place in the Suffolk County town of Brookhaven, New York, United States. The population was 15,481 at the 2010 census. The first settlement in what is now called Farmingville occurred in the late 18th century, and was called Bald Hills and Mooney Ponds, before it eventually was called Farmingville. Th…Farmingville is a hamlet and census-designated place in the Suffolk County town of Brookhaven, New York, United States. The population was 15,481 at the 2010 census. The first settlement in what is now called Farmingville occurred in the late 18th century, and was called Bald Hills and Mooney Ponds, before it eventually was called Farmingville. The Keibel Family had a 72-acre fruit and vegetable farm from 1950 till 1982. It did not have its own post office until 1950.