Cedar Mill is a suburb of Portland, Oregon; it is a census-designated place and an unincorporated community in Washington County, mostly north of U.S. Route 26 and west of the Willamette Stone. It received its name from a sawmill on Cedar Mill Creek, which cut Western Redcedars, which were the dominant tree in the area; the mill's pond was near the intersection of 119th and Cornell Road, which could still be seen into the 1960s. The name was established in 1874 with the opening of a U.S. post office named Cedar Mill.