Yuengling
D. G. Yuengling & Son is the oldest operating brewing company in the United States. It was started in 1829. It is one of the largest breweries by volume in the country. Based on sales in 2011, Yuengling was tied with the Boston Beer Company, maker of Samuel Adams brands, as the largest producer of beer in the United States. Yuengling's headquarters are in Pottsville, Pennsylvania.  Yuengling produces about 2.5 million barrels of beer a year. They operate two breweries in Pennsylvania and one in Tampa, Florida.