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How To Receive School News and Information

Check this website first for accurate information  It is updated daily.


Click here to learn how to download the Mount Si High School APP. 


Follow us on Facebook, Instagram, and Twitter. We post important reminders and showcase student achievements.


Follow student activities on our ASB Website and Instagram!


Sign up for weekly email from us.




Call us!  We are happy to assist you:  425.831.8100