Brewery (Number of groups) (Click a Brewer to view coasters)	Sort by code	Sort by Production Dates *RED = CLOSED*	Sort by city	Sort by count
Oak Union Brewing	OR-OAKU	2023-	Oak Grove	1
Oakshire Brewing	OR-OAK	2008-	Eugene	72
Obelisk Beer Co.	OR-OBEL	2022-	Astoria	1
Oblivion Brewing Co.	OR-OBLI	2013-	Bend	8
Occidental Brewing Co.	OR-OCC	2011-	Portland	8
Ochoco Brewing Co.	OR-OCH	2016-2020	Prineville	3
Old 99 Brewing Co.	OR-OL99	2013-2023	Roseburg	4
Old Chicago	OR-OLDC	1994-	Portland	1
Old Lompoc	See: New Old Lompoc Brewing (Lompoc Brewing) (OR-NLOMP)
Old Market Pub & Brewery	OR-OMKT	1994-	Portland	2
Old Mill Brew Werks	OR-OLDM	2011-2015	Bend	3
Old Town Brewing Co.	OR-OLDT	2012-	Portland	15
Old World Pub & Brewery	OR-OWOR	1999-2000	Portland	1
Omission	See: Widmer Brewing Co. (Craft Brew Alliance) (OR-WIDM)
Opposition Brewing Co.	OR-OPPO	2012-2023	Medford	2
Ordnance Brewing Co.	OR-ORDN	2015-2023	Boardman	22
Oregon Ale & Beer Co.	OR-OAB	1995-	Portland	37
Oregon Brewing Co	See: Rogue Ales & Spirits (Oregon Brewing Co.) (OR-ROGU)
Oregon City Brewing Co.	OR-ORCT	2011-	Oregon City	8
Oregon Fields Brewing Co.	See: Fields Brewing Co. (OR-FLDS)
Oregon Trader Brewing Co.	OR-OTRA	1993-2006	Albany	2
Oregon Trail Brewery	OR-OTRL	1987-	Corvallis	19
Oregon brewers with coasters:				18
Alternate brewer referencess:				4
total record count:				29