Founded in 2010, the OMO consists of about 30 members and has been led by music director Christian McKee since April 2017.

[2] The orchestra performed its first concert on April 9, 2010, at the Glenn & Viola Walters Cultural Arts Center in downtown Hillsboro.

[2] OMO's April 2011 concert featured works by Antonio Vivaldi and was held at The Old Church in Portland.

[2] The group's May 2011 concert included a version of Led Zeppelin's "Kashmir", as well a pieces from Johann Sebastian Bach and Felix Mendelssohn, among others.

[12] Oregon Mandolin Orchestra's 2011 holiday concert in December featured a Brazilian Choro duo as well as a selected portion of the Nutcracker Suite.