Counties in Washington

• Adams (8 historic properties)
• Asotin (8 historic properties)
• Benton (14 historic properties)
• Chelan (44 historic properties)
• Clallam (49 historic properties)
• Clark (39 historic properties)
• Columbia (20 historic properties)
• Cowlitz (29 historic properties)
• Douglas (12 historic properties)
• Ferry (9 historic properties)
• Franklin (13 historic properties)
• Garfield (3 historic properties)
• Grant (10 historic properties)
• Grays Harbor (20 historic properties)
• Island (7 historic properties)
• Jefferson (70 historic properties)
• King (257 historic properties)
• Kitsap (22 historic properties)
• Kittitas (24 historic properties)
• Klickitat (10 historic properties)

• Lewis (32 historic properties)
• Lincoln (9 historic properties)
• Mason (13 historic properties)
• Okanogan (14 historic properties)
• Pacific (18 historic properties)
• Pend Oreille (7 historic properties)
• Pierce (182 historic properties)
• San Juan (18 historic properties)
• Skagit (28 historic properties)
• Skamania (3 historic properties)
• Snohomish (48 historic properties)
• Spokane (130 historic properties)
• Stevens (21 historic properties)
• Thurston (61 historic properties)
• Wahkiakum (5 historic properties)
• Walla Walla (28 historic properties)
• Whatcom (67 historic properties)
• Whitman (33 historic properties)
• Yakima (67 historic properties)