Less than two years after arriving in Oregon, Marquam married Emma Kern, on May 8, 1853."P.A. Marquam Dies on Wedding Date; Pioneering Jurist of Portland Passes on 59th Anniversary of Marriage". (May 9, 1912). The Morning Oregonian, p. 4. 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. Emma Marquam died in 1902.
