Nevada is located pretty far outside the U.S. Manufacturing Core, and doesn’t have any of the traditional industries, like steel, iron, or coal. Its most profitable industry is gaming. The top five revenue-generating companies in Nevada are all gaming-product companies, with Bally and International Gaming Technologies commandeering two slots apiece.
In addition to gaming, Nevada also has printing and publishing businesses, some food-related manufacturers, concrete plants, and machinery factories.
Information from manta.com, and netstate.com. Pictures from Google.