Location: Petaluma, California
Year Established: 1993
Website: lagunitas.com

Fifth largest by sales volume, the Petaluma brewery is about to undertake a $25 million expansion. And in the game of West Coast IPA vs. East Coast IPA, Lagunitas IPA is practically the definition of the former. Aggressively hopped but well rounded, it's a classic example, and the brewery continues to make instant classics with their other year-round brews and several seasonal options to boot. They're definitely one of the most well-known breweries across the country.