The famous American whiskey, Bourbon has got its name from Bourbon County, Kentucky, the birthplace of bourbon whiskey. Bourbon whiskey is distilled and produced in Bourbon County, Kentucky, United States, and no other country has the authority to call their whiskey products Bourbon.
According to the Federal requirements, Bourbon whiskey is made from at least 51% corn or maize — typically about 70% — with the remainder being wheat and/or rye, and malted barley. It is distilled to no more than 160 (U.S.) proof and aged in new charred oak barrels for at least two years. The whiskey called "bourbon," do not legally require two years maturation process, however "straight bourbons” do legally require that. In general practice most bourbon whiskeys are aged for at least four years.
Bourbon whiskey is required to be put into the barrels and it need to be adjusted at no more than 125 U.S. proof. Generally, it is adjusted to 80–100 proof and bottled. Some jurisdictions prevent selling the alcoholic beverages with over 40% alcohol content. However, currently most of the distillers are bottling higher proof alcoholic contents.
Legally considered a “distinctive product of the United States, Bourbon whiskey can be made anywhere in the United States where it is legal to distill spirits. Legally the production of Bourbon whiskey is not restricted to Kentucky, although currently all but a few brands are made there, and the drink is associated strongly with that state. Illinois once produced nearly as much Bourbon Whiskey as Kentucky, and Bourbon whiskey continues to be made in Virginia. In the past Bourbon whiskey has been made in Pennsylvania, Indiana, Ohio, Tennessee, Missouri and Kansas.