West Babylon is located at 40°43′49″N 73°21′27″W / 40.73028°N 73.35750°W (40.713399, -73.357106).
West Babylon is bordered to the west by Lindenhurst and North Lindenhurst, to the northwest by East Farmingdale, to the north by Wyandanch, to the northeast by Deer Park, to the east by North Babylon and the Village of Babylon, and to the south by the Great South Bay.
According to the United States Census Bureau, the CDP has a total area of 8.0 square miles (21 km2), of which 7.7 square miles (20 km2) is land and 0.3 square miles (0.78 km2), or 3.87%, is water.
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