This company was originally founded in 1994 as Cadabra.com. Its headquarters is in the Beacon Hill neighborhood.
Founded in 1987 as the Urban Juice and Soda Company, it changed its name to Jones Soda in August 2000.
This largest chain of coffee shops in the world was founded in Pike Market in 1971. I'm not necessarily a big fan of the company or their coffee but what they have done for the coffee market in general is amazing.
Best known for Real Audio, Real Player and Real Video, this internet media provider was founded by an ex-Microsoft executive in 1993.
While not actually a corporation, this shopping center in the Northgate district (catchy name, huh?), which opened in 1950, was the first "mall" in the United States.
For those that are wondering.....Microsoft did not make this list because their headquarters is in Redmond, WA, not Seattle. In fact, the company itself was not even founded in the state of Washington. Gates started the company in New Mexico.