Firearms Academy of Seattle, Inc.

http://www.firearmsacademy.com

A premier place to learn about Firearm safety, self-defense, and other firearm related matters.  Their free Firearm Safety class is the best I have ever attended!  I would recommend this to everyone, even those who have been carrying for years.

All the businesses that are listed here have been confirmed to be friendly to Open Carriers.
I would like to thank just_a_car for compiling this list of these fine businesses.

Subway (6509 132nd Ave NE) - Kirkland
Schucks (7201 W Clearwater Ave) - Kennewick
Double Eagle (607 S Oakes St) - Tacoma
Edge of the Circle Books (701 E. Pike st) - Seattle
Claim Jumpers (5901 S 180th St) - Tukwila
Sam's Gun Shop & Range (11714 Airport Road {aka 128 St}) - Everett
JavaFlow Coffee (207 Washington St NE) - Olympia
Mail Masters (8103 Steilacoom Blvd SW) - Lakewood
Sonic Drive-In (1313 N Ruby St) - Spokane
Hardware Sales (2034 James St.) - Bellingham
Denny's Restaurant (301 E Wallace Kneeland Blvd Ste 105) - Shelton
Denny's Restaurant (1616 Black Lake Blvd SW) - Olympia
Walmart (Corporate Policy is to be "in-line" with state law)
Sheri's (15252 Aurora Avenue, N.) - Shoreline
Sheri's (12207 NE 116th) - Kirkland
Beth's Cafe (7311 Aurora Ave N.)- Seattle
Quizno's (255 E Main St) - Pullman
Sure Shot (1016 W Pullman Rd) - Moscow, ID
DelBrocco's Pizza, Steak & Hoagie (3908 6th Ave) - Tacoma
Wally's (Deli Style) 2106 Harrison Ave; Olympia, WA 98502
Sportsman's Warehouse (Corporate-wide Policy is to be "in-line" with state law)
Wally's Diner (2106 Harrison Ave) - Olympia
24 Hour Fitness (529 Parkplace Ctr) - Kirkland
Lowe's (Corporate-wide Policy is to be "in-line" with state law)
Jimmy Mac's Roadhouse (34902 Pacific Hwy S) - Federal Way
Tacoma Dodge (4101 S Tacoma Way) - Tacoma
Granite Falls Hardware (108 S Granite Ave) - Granite Falls
Cascade Arms (3959 Martin Way East) - Olympia