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'Keefe's Brewing	ON-OKEE	1846-1967	Toronto/Waterloo	25
Old Comrades Brewery Ltd.	ON-OLDR	1948-1953	Tecumseh	11
Old Credit Brewing Co. Ltd, The	ON-OLDC	1994-	Mississauga	8
Old Dog Brewing Co.	ON-OLDD	2018-	Bobcaygeon	2
Old Dominion	ON-ODOM	Not a brewer	Toronto	1
Old Flame Brewing	ON-OLDF	2013-	Port Perry & Newmarket	6
Old Mill Brewery	ON-OLDM	?-	Ashton	1
Olde Stone Brewing Co., The	ON-OLDE	1996-2021	Peterborough	6
Ontario Craft Brewers	ON-ONTC	?-	Toronto	1
Orange Snail Brewers	ON-ORAN	2015-	Milton	3
Orleans Brewing Co.	ON-ORLE	2017-	Orleans	5
Ottawa Valley Brewing Co. Inc.	ON-OTTA	1987-1990.	Nepean,	19
Outlaw Brew Co.	ON-OUTL	2014-	Southampton	4
Outspoken Brewing	ON-OUTS	2015-	Sault Ste Marie	4
Overflow Brewing Co	ON-OVER	2018-	Ottawa	16
Overhop Brewing	ON-OVEH		Toronto	2
Ontario brewers with coasters:				16
Alternate brewer referencess:
total record count:				19