In 1862, he was elected Multnomah County judge.[2] He served eight years in the position,[2] having been re-elected to a second four-year term in 1866.[3]
He built the Marquam Grand Opera House in Portland, later renamed the Orpheum Theater. The theater was torn down in the 1922. It was located in the downtown Portland block bounded by Broadway, Alder, 6th and Morrison streets, which block was owned by Marquam. In the south half of the same block he built an eight-story office building, the Marquam Building, completed around 1892, next to his home, a small house at the southeast corner of the block.[2] The office building and house were later torn down and replaced by the Northwestern National Bank Building.[2]
Less than two years after arriving in Oregon, Marquam married Emma Kern, on May 8, 1853.[3] Eleven children were born to the couple, four sons and seven daughters. The youngest child, Thomas Alfred "Tom" Marquam, served as mayor of Fairbanks, Alaska from 1923 to 1925.[5][6] Emma Marquam died in 1902.[3]
Marquam died at the home of one of his daughters, in southwest Portland, shortly after midnight on May 8, 1912, four days after suffering a stroke.[3] He is buried in River View Cemetery in Portland.
Bearing his name is the Marquam Bridge in Portland, opened in 1966, Marquam Hill and the adjacent Marquam Gulch and Marquam Nature Park. The community of Marquam, Oregon, is named for his older brother, Alfred.[1]
^ abcdeHazen, David W. (April 2, 1934). "Romantic Portland Streets: Marquam [Hill] Road Named in Honor of Philip A. Marquam, One of Portland's Picturesque Pioneers, Who Came to City in 1851". The Morning Oregonian, p. 9.