It appears that many of these pictures were taken at Pacific Raceways (aka Seattle International Raceways) in the 1960s. PR was late to open -- I think around 1964 or 1965. It's possible that some of these were taken in Vancouver or at Shelton Raceway (although they look too hilly for Shelton -- an airstrip course.)
I know the guy in the Porsche Carrera 6 (906)-- it's Wade Carter of Carter VW. He raced that car until about four years ago, when he was tragically killed in a helicopter accident. NICEST guy in the world.
I sent the link to my father, who was really into the Northwest racing scene, and even was an editor of Northwest Motor News. I have a feeling he'll recognize the Lotus XI, and maybe the Elite, as well as maybe the Formula Jrs.
Sam