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
Mackinnon Brothers Brewing Co.	ON-MACK	2014-	Bath	8
Macleans Ales	ON-MACL	2009-	Hanover	4
Madmash Brewery	ON-MADM	2024-	Tavistock	2
Magnotta Brewery	ON-MAGN	1996-	Vaughan	31
Manantler Craft Brewing Co.	ON-MANA	2014-2022	Bowmanville	58
Manitoulin Brewing	ON-MANI	2015-	Little Current	2
Maple Beer Co.	ON-MAPL	2017-	Kingston	1
Market Brewing Co.	ON-MARK	2014-	Newmarket	6
Mascot Brewery	ON-MASC	2015-	Toronto	2
Mash Paddle Brewing Co.	ON-MASH	2015-2023	Brantford	5
Master's Brewpub	ON-MAST	1988-??	Ottawa	2
Matron Fine Beer	ON-MATR	2019-	Bloomfield	1
Merchant Ale House, The	ON-MERC	1999-	St. Catharines	3
Merit Brewing	ON-MERI	2017-	Hamilton	7
Meuse Brewing	ON-MEUS	2020-	Scotland	1
Meyers Creek Brewing Co.	ON-MEYE	2019-	Belleville	3
Midtown Brewing Co.	ON-MIDT	2017-	Wellington	1
Mill St. Brewery	ON-MILL	2002-	Toronto	64
Molson (16)	ON-MOL	1786-	Toronto	1942
Mono Centre Brewing Co.	ON-MONO	2022-	Mono	1
Motor Craft Ales	ON-MOTO	2012-??	Windsor	1
Muddy York Brewing Co.	ON-MUDY	2013-	Whitchurch-Stouffville	7
Mudtown Station Brewery	ON-MUDT	2020-	Owen Sound	1
Muskoka Brewery	ON-LMCB	1996-	Bracebridge	80
Ontario brewers with coasters:				24
Alternate brewer referencess:
total record count:				85