Actually, I’m not sure why King and Pierce County had such low voter turnout for the 8/21 primary but I did rememember that traffic on I-5 was a mess so maybe they didn’t want to drive to the post office. According to the Secretary Of State’s office, the turnout in King County was 24.76% and the turnout in Pierce was 24.47%.
Here’s the turnout in Central Washington Counties:
Okanagan 55.34%
Chelan 49.83%
Kittitas 39.10%
Yakima 36.34%
Benton 27.36%
Franklin 21.60%
Here’s the full report: 2007-primary-preliminary-turnout-data.pdf