Pin oak is native to the United States and grows mainly in wetlands of the north central and eastern states. A popular shade tree, the pin oak grows to a height of over 100 feet with a trunk diameter of up to 3 feet. It gets its name from the large amount of pin-like twigs that emerge on the branches. The wood of the tree is hard and heavy and is used in general construction and for firewood. Acorns, the fruit, are a source of food for wildlife such as deer and squirrels.