| Lagunitas Seattle Taproom and Beer Sanctuary | 1550 NW 49th St | Seattle | Washington | 98107-4731 | United States | brewpub | |
| Laht Neppur Brewing | 444 Preston Ave | Waitsburg | Washington | 99361-0738 | United States | brewpub | |
| Lake Chelan Brewing Co | 50 Wapato Way | Manson | Washington | 98831 | United States | micro | |
| Lake Stevens Brewing Company | 2010 Grade Rd | Lake Stevens | Washington | 98258-9182 | United States | micro | |
| Lantern Brewing | 938 N 95th St | Seattle | Washington | 98103-3206 | United States | micro | |
| Larrabee Lager Co | 4151 Meridian St | Bellingham | Washington | 98226 | United States | brewpub | |
| Laurelwood Public House and Brewery - NE | 14300 NE 145th St | Woodinville | Washington | 98072-6950 | United States | closed | |
| Lazy Boy Brewing | 715 100th St SE Ste A1 | Everett | Washington | 98208-3762 | United States | micro | |
| Little Spokane Brewing Company | 154 S Madison St Ste 101 | Spokane | Washington | 99201-4542 | United States | closed | |
| Locust Cider & Brewing Co | 19151 144th Ave NE Unit B/C | Woodinville | Washington | 98072-4374 | United States | micro | |
| Logan Brewing Company | 510 SW 151st St | Burien | Washington | 98166 | United States | micro | |
| Loowit Brewing | 507 Columbia St | Vancouver | Washington | 98660-3194 | United States | micro | |
| Lopez Island Brewing Co | 4817 Center Rd | Lopez Island | Washington | 98261-8653 | United States | closed | |
| Lost Canoe Brewing Co | 1208 10th St | Snohomish | Washington | 98290-2099 | United States | closed | |
| LoveCraft Brewing Co | 275 5th St Ste 101 | Bremerton | Washington | 98337-1907 | United States | micro | |
| Lowercase Brewing | 6235 Airport Way S | Seattle | Washington | 98108-4377 | United States | brewpub | |
| Lucky Envelope Brewing | 907 NW 50th St | Seattle | Washington | 98107-3635 | United States | micro | |
| Lumber House Brewing Company | 30741 3rd AVE Suite 133 | Black Diamond | Washington | 98010 | United States | micro | |
| Lumberbeard Brewing | 25 E 3rd Ave | Spokane | Washington | 99202 | United States | micro | |
| Mac and Jacks Brewery Inc | 17825 NE 65th St Ste B110 | Redmond | Washington | 98052-4995 | United States | regional | |
| Machine House Brewery | 5840 Airport Way S Ste 121 | Seattle | Washington | 98108-2751 | United States | micro | |
| Maelstrom Brewing Company | 11014 120th Ave NE | Kirkland | Washington | 98033-5022 | United States | micro | |
| Magnuson Cafe and Brewery | 7801 62nd Ave NE | Seattle | Washington | 98115 | United States | brewpub | |
| Manfish Brewing | 19611 276th Ave SE | Issaquah | Washington | 98027-8292 | United States | micro | |
| Maritime Pacific Brewing Co | 1111 NW Ballard Way | Seattle | Washington | 98107-4639 | United States | micro | |
| Masters BrewHouse | 831 S Main St Suite M | Deer Park | Washington | 99006 | United States | brewpub | |
| Matchless Brewing | 8036 River Dr SE Ste 208 | Tumwater | Washington | 98501-6814 | United States | micro | |
| McMenamins Anderson School Brewery | 18607 Bothell Way NE | Bothell | Washington | 98011-1928 | United States | brewpub | |
| McMenamins East Vancouver Brewery | 1900B NE 162nd Ave Ste B107 | Vancouver | Washington | 98684-3013 | United States | brewpub | |
| McMenamins Elks Temple | 565 Broadway | Tacoma | Washington | 98402 | United States | brewpub | |
| McMenamins Kalama Harbor Lodge | 215 N Hendrickson Dr | Kalama | Washington | 98625 | United States | brewpub | |
| McMenamins Mill Creek Brewery | 13300 Bothell Everett Hwy Ste 304 | Mill Creek | Washington | 98012-5312 | United States | brewpub | |
| McMenamins Olympic Club Brewery | 112 N Tower Ave | Centralia | Washington | 98531-4220 | United States | brewpub | |
| McMenamins On the Columbia Brewery | 1801 SE Columbia River Dr | Vancouver | Washington | 98661-8030 | United States | brewpub | |
| McMenamins Queen Anne Brewery | 200 Roy St Ste 105 | Seattle | Washington | 98109-4110 | United States | brewpub | |
| McMenamins Six Arms Brewery | 300 E Pike St | Seattle | Washington | 98122 | United States | brewpub | |
| McMenamins Spar Cafe Brewery | 114 4th Ave E | Olympia | Washington | 98501-1103 | United States | brewpub | |
| Melvin Brewing Bellingham | 2416 Meridian St | Bellingham | Washington | 98225-2405 | United States | closed | |
| Menace Brewing | 2529 Meridian St | Bellingham | Washington | 98225-2406 | United States | micro | |
| Metier Brewing Company | 14125 NE 189th St | Woodinville | Washington | 98072-6831 | United States | micro | |
| Middleton Brewing Co | 607 SE Everett Mall Way Ste 27A | Everett | Washington | 98208-3264 | United States | brewpub | |
| Mile Post 111 Brewing | 407 Aplets Way | Cashmere | Washington | 98815 | United States | brewpub | |
| Mill City Brew Werks | 339 NE Cedar St | Camas | Washington | 98607-2142 | United States | closed | |
| Mill Creek Brewpub | 11 S Palouse St | Walla Walla | Washington | 99362-1925 | United States | closed | |
| Millwood Brewing Company | 9013 E Frederick Ave | Spokane | Washington | 99212-2108 | United States | micro | |
| Mirage Beer Co | 943 NW 50th St | Seattle | Washington | 98107 | United States | proprietor | |
| Mollusk Brewing | 803 Dexter Ave N | Seattle | Washington | 98109-4320 | United States | brewpub | |
| Monka Brewing Co | 17211 15th Ave NE | Shoreline | Washington | 98155 | United States | brewpub | |
| Moonshot Brewing | 8804 W Victoria Ave # 140 | Kennewick | Washington | 99336 | United States | micro | |
| Mountain Lakes Brewing Company | 201 W Riverside Ave | Spokane | Washington | 99201 | United States | micro | |