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.

Before white settlement, the land was inhabited by the Atfalati, a subgroup of the Kalapuya, called the "Tualatin" or "Wapato Lake Indians" by settlers.

By 1890, the members of the tribe had been reduced to 28 and the last known speaker of the Tualatin language, Louis Kenoyer, died in 1936.

The sawmill was established in 1859 by John Halsey Jones and his father, Justus, and was the "first organized business"[8][9] in what is now Cedar Mill.

[10] The Jones Sawmill was sold in December 1869 to John Quincy Adams Young and William Everson, becoming the Young–Everson Mill.

Their son Joseph Murray sold the farm due to debts brought on by the Great Depression in 1936.

According to Oregon Geographic Names, a "Cedar Mill" post office was established in 1874, in the John Quincy Adams Young House,[15] built in 1869, which still stands on Cornell Road and is owned by the Tualatin Hills Park & Recreation District.

The Young–Everson sawmill, specializing in cedar products, was still the only business operating in the area at the time and was also located directly adjacent to the post office, making "Cedar Mill" a logical choice for the name of the new postal station.

[17] Along with the post office, Young also operated a small store on the ground floor of his former house.

The Cedar Mill post office, always located within a store, was moved two more times before closing on July 3, 1904.

[26][27] According to the United States Census Bureau, the CDP has a total area of 3.7 square miles (9.6 km2), all land.

[9][30] The Sue Conger Memorial Boardwalk, opened in June 2013, allows visitors of all abilities to view the falls.

[34] Cedar Mill is served by the Tualatin Hills Park & Recreation District (THPRD), which maintains several parks and a few nature trails in the area, as well as the Sunset Swim Center (public swimming pool adjacent to and used by Sunset High School).

Virginia Bruce operates the Cedar Mill News, a monthly newsletter running since January 2003.

A non-profit organization named the Cedar Mill Community Library Association (founded in 1974) opened the area's first public library in 1976, located in a shopping center at the intersection of Cornell Road and Saltzman Road (the Milltowner Shopping Center).

[39][40] Following expansions in 1978, 1988 and 2001, the Cedar Mill Community Library now occupies 24,500 square feet (2,280 m2) of space.

[41] The current site is in a former Rodgers store, which closed in 1988 and was remodeled for the library, which previously had been located in much smaller space in another building in the same shopping center.

The first school, serving grades 1 through 8, was built on land donated by pioneer Samuel Walters.

143rd Avenue adjacent to the Union Cemetery, was replaced by a new two-room building on the same site in 1901, and the school remained in operation until 1948.

In 1979, shortly before the school's closure in spring 1980, the building was acquired by Electro Scientific Industries[50] (whose main campus was located nearby) and used as ESI's administrative headquarters until the mid-1990s, when it was razed and replaced by a Home Depot store.