From Cascadia Scorecard Weblog::

The US Census Bureau has issued population estimates for the states, which allow us to give an updated Cascadian population tally. As of July 1, 2005, the region -- counting British Columbia, Idaho, Oregon, and Washington -- had 15.6 million people. (Adding western Montana, southeast Alaska, and northwestern California pushes that figure up by another million or so, but running the county-by-county figures takes more time than I've got at the moment.)

The (four main jurisdictions of the) region added 227,000 inhabitants over the preceding 12 months. That's about the number that live in greater Olympia, Washinton. And it's a 1.5 percent increase, the largest since 1997.

I had no idea so many people live in the greater Olympia area.