Cedar Mill is a suburb in the Portland, Oregon metropolitan area of the United States; it is a census-designated place and an unincorporated community in Washington County, 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 that were once the dominant tree in the area. The mill's pond was near the intersection of 119th and Cornell Road, and could still be seen into the 1960s, although the mill itself had ceased operating in 1891. The name was established in 1874 with the opening of a U.S. post office named Cedar Mill. As of the 2020 census, the community population was 17,259.

The Portland metropolitan area is a metro area with its core in the U.S. states of Oregon and Washington. It has 5 principal cities the largest being Portland, Oregon. The U.S. Office of Management and Budget (OMB) identifies it as the Portland–Vancouver–Hillsboro, OR–WA Metropolitan Statistical Area, a metropolitan statistical area used by the United States Census Bureau (USCB) and other entities. The OMB defines the area as comprising Clackamas, Columbia, Multnomah, Washington, and Yamhill Counties in Oregon, and Clark and Skamania Counties in Washington. The area had a population of 2,512,859 at the 2020 census, an increase of over 12% since 2010.