"O" Breweries
O'Connor Brewing Co. (Norfolk, VA)
O'so Brewing Co. (Plover, WI)
Oak Creek Brewing Co. (Sedona, AZ)
Oaken Barrel Brewing Co. (Greenwood, IN)
Oakshire Brewing Co. (Eugene, OR)
Oasis Brewery (Boulder, CO)
Ocean City Brewing Co. (Ocean City, MD)
Ocean Lab Brewing Co. (Isla Verde, PR)
Oconto Brewing Co. (Oconto, WI)
Odd Side Ales (Grand Haven, MI)
Odell Brewing Co. (Ft. Collins, CO)
O'Fallon Brewery (Maryland Heights, OH & O'Fallon, OH)
Off Color Brewing Co. (Chicago, IL)
Old Bust Head Brewing Co. (Warrenton, VA)
Old Detroit Brewing Co. (Detroit, MI)
Old Dominion Brewing Co. (Dover, DE & Ashburn, VA)
Old European Brewing Co. (Evansville, IN & Cold Spring, MN)
Old Lehigh Brewing Co. (Allentown, PA)
Old Nation Brewing Co. (Williamstown, MI)
Old Peconic Brewing Co. (Shelter Island, NY)
Old Planters Brewing Co. (Beverly, MA)
Old West Brewing Co. dba of Florida Beer Brands (Orlando, FL) (Contract New Ulm, MN)
Olde English 800 Brewing Co. (Milwaukee, WI)
Owned by Blitz-Weinhard 1964-1979; Pabst 1979-1999; Miller 1999-present
Owned by Blitz-Weinhard 1964-1979; Pabst 1979-1999; Miller 1999-present
Olde Heurich Brewing Co. (Washington, DC)
Olde Hickory Brewery (Knoxville, TN)
Olde Mecklenburg Brewery (Charlotte, NC)
Old Time Brewing Co. (Boston, MA)
Olde Towne Brewing Co. (Huntsville, AL)
Oldenberg Brewing Co. (Ft. Mitchell, KY)
Olympia Brewing Co. (Tumwater, WA) (purchased by G. Heilman, Pabst, and Miller-Coors)
Omission Brewing Co. (Portland, OR) (Widmer Brothers Brewing Co.)
Brewery Ommegang (Coopertown, NY)
One Barrel Brewing Co. (Madison, WI)
Opa Opa Brewing Co. (Southampton, MA)
Ordnance Brewing Co. (Boardman, OR)
Ore Dock Brewing Co. (Marquette, MI)
Oregon Ale and Beer Co. (Portland, OR)
Orlio Organic Beer Co. (South Burlington, VT)
Henry Ortleib's (Philadelphia, PA)
Oshkosh Brewing Co. (Oshkosh, WI)
Otra Beer Co. (Gilroy, CA)
Otter Creek Brewing Co. (Middlebury, VT)
Otto's Pub & Brewery (State College, PA)
Out of Bounds Brewing Co. (Rocklin, CA)
Oxford Brewing Co. (Baltimore, MD)
