- Alumni.net – Concord, CA
- Provides links to schools with alumni registry, member directory, people finder, and bulletin posts.
- Mt. Diablo High School – 1985
- Contains updates and bulletins for the school batch, reunion information, alumni messages and resources.
- Mt. Diablo High School Alumni Association
- Devoted to building and maintaining a comprehensive alumni database to reunite classes and individuals.
- Ygnacio High School – 1979
- Provides links to relevant sites – 1979 yearbook, alumni search, class photos, school site, and reunion updates.
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