At the last count the US had 4,269 craft breweries, of which 2,397 were classed as microbreweries. A microbrewery is defined as an operation producing less than 15,000 barrels per year and selling more than 25% of that off-site. One barrel holds enough beer to fill around 330 12 ounce bottles so a brewer could fill nearly five million bottles a year yet still qualify as “micro.”
To complete the picture, there are also 1,650 brew pubs, (places that brew and sell mostly on-site,) and 178 regional breweries. A regional produces more than a microbrewery but less than 6 million barrels per year. So without doing any math it’s apparent a lot of breweries are filling millions of bottles with a glorious array of traditional and innovative new brews.