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
O'Shaughnessy Ltd.	See: Ortlieb, Henry F., Brewing Co. (PA-ORT)
Oakbrook Brewing Co.	PA-OAKB	2016-	Reading	4
Odd Logic Brewing Co	PA-ODDL	2019-	Bristol	41
Oil City Brewing Co.	PA-OILC	1933-1936	Oil City	13
Old Dutch Brewing Co.	See: Horlacher Brewing Co. (PA-HORL)
Old Forge Brewing Co.	PA-OFBC	2008-	Danville	6
Old Indian Brewing Co.	PA-OLDI	1937-1939	Indiana	6
Old Lancaster Brewing Co.	PA-OLDL	1933-1941	Lancaster	13
Old Lehigh Brewing Co.	PA-OLEH	1997-2001	Allentown	5
Old Reliable Brewing Co.	PA-OLDR	1941-1942	Greensburg	1
Olde Bedford Brewing	PA-OLDE	2018-	Bedford	5
Ortlieb, Henry F., Brewing Co.	PA-ORT	1893-1987	Philadelphia	131
Oswald, V.A., American Brewery	PA-OSWA	1900-1936	Altoona	12
Otto's Pub & Brewery	PA-OTTO	2002-	State College	24
Our Town Brewery	PA-OURT	2020-	Lancaster	1
Pennsylvania brewers with coasters:				13
Alternate brewer referencess:				2
total record count:				16