Contact Us | A Classical Christian Middle and High School in Portland, Oregon | Trinity Academy Trinity Academy 7424 N Mississippi Ave. Portland, OR 97217-5053 (503) 567-9559 Fax: (503) 451-6798 info@trinityacademyportland.org Please contact us with any questions. For additional information about the school and our mission, please complete and submit the short request form. Please send me additional information about Trinity Academy. Items marked with "*" are required. Please send me additional information about Trinity Academy. Items marked with "*" are required. #1 BEST Private School in Multnomah County!