Marquam is an unincorporated community in Clackamas County, Oregon, United States. It is located on Oregon Route 213, between the cities of Molalla and Silverton. Marquam was named for pioneer settler Alfred Marquam, who came to Oregon in 1845 from the east. He secured a donation land claim of 640 acres (2.6 km2), and built the first house and the first store in the town. In 1889 the Marquam post office was established and named for Alfred Marquam, who was also the first postmaster. His younger brother was Philip Augustus Marquam, a noted early judge in Oregon.