- Everett AquaSox@
- Everett
- Osborne Innovative Products, Inc.
 - Enumclaw - Manufactures and markets baseball and softball training equipment, including screens, cages, tees, mats, and instructional books and videos. - Rebound Sports Technology
- Kent - Makers of Swingaway, batting practice equipment that replaces the hitting tee.
- Seattle Pilots@
- Seattle
- Seattle Rainiers
- Seattle - User-generated history of the Seattle Rainiers minor league baseball team.
- Tacoma Baseball
- Tacoma - Includes team links, schedules, tournaments, articles, and more.
- Tacoma Rainiers@
- Tacoma
- United States Amateur Baseball Association
- Seattle - Provides for the promotion and development of players and fans in youth baseball past season tournament competitions.
- Western Washington Baseball Umpires Association
- Tacoma - Includes training, meeting, and employment information.
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