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-Town Brewing Co.	WA-OTOW	2015-	Olympia	1
Obec Brewing	WA-OBEC	2017-	Seattle	4
Odd Otter Brewing Co.	WA-ODDO	2014-	Tacoma	8
Odin Brewing Co.	WA-ODIN	2009-2022	Tacoma	27
Off Camber Brewing	WA-OFFC	2017-	Puyallup	1
Ogres Brewing	WA-OGRE	2016-	Clinton	2
Old Ivy Brewery & Tap Room	WA-OLDI	2013-2021	Vancouver	3
Old Schoolhouse Brewery	WA-OSCH	2015-	Winthrop	15
Old Stove Brewing Co.	WA-OLDS	2016 -	Seattle	7
Olympia Brewing Co.	WA-OLY	1896-1983	Olympia, Tumwater	141
Olympic Club	See: McMenamin's coasters - Olympic Club (OR-MCM)
Onalaska Brewing Co. (Red Dawg Brewpub)	WA-ONAL	1999-2002	Chehalis	9
Optimism Brewing Co.	WA-OPT	2015-2023	Seattle	2
Orchard Street Brewery	WA-ORCH	1995-	Bellingham	19
Orlison Brewing Co.	WA-ORL	2013-2018	Airway Heights	14
Otherlands Beer	WA-OTHE	2020-	Bellingham	2
Outer Planet Brewing	WA-OUTR	2015-	Seattle	7
Outlander Brewing Co.	WA-OUTL	2012-	Seattle	5
Outskirts Brewing Co, The	WA-OUTS	2023-	Selah	1
Washington brewers with coasters:				18
Alternate brewer referencess:				1
total record count:				20