TMCMS was organized on June 29, 1889. The object of the society was the “cultivation and advancement of medical science.” Membership dues in those days were, after a $3.00 initiation fee, just twenty-five cents per month. The first elected President was N. Ostrander, MD.

On November 2, 1905, Mason County physicians joined Thurston County physicians to become the Thurston-Mason County Medical Society.

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