West Whittier-Los Nietos (pronunciationⓘ) is a census-designated place (CDP) in Los Angeles County, California, near the San Gabriel River and the San Gabriel River (I-605) Freeway.

The census area consists of separate unincorporated communities of Los Nietos (Spanish for "the grandchildren") and West Whittier.

West Whittier-Los Nietos is located at 33°58′34″N 118°4′8″W / 33.97611°N 118.06889°W / 33.97611; -118.06889 (33.976113, -118.069000),[3] or about three miles (5 km) northwest of Whittier.

[4] According to the United States Census Bureau, the CDP has a total area of 2.5 square miles (6.5 km2), all land.

The racial makeup of West Whittier-Los Nietos was 15,170 (59.4%) White (9.3% Non-Hispanic White),[25] 254 (1.0%) African American, 372 (1.5%) Native American, 393 (1.5%) Asian, 43 (0.2%) Pacific Islander, 8,404 (32.9%) from other races, and 904 (3.5%) from two or more races.

According to the 2010 United States Census, West Whittier-Los Nietos had a median household income of $60,525, with 9.4% of the population living below the federal poverty line.

The Los Nietos School District was established in 1861 and a Methodist circuit centered on the city was founded in 1867.

Herschel K. Mitchell (1913–2000), biochemist and geneticist, was born in Los Nietos The area is served by the Whittier Union High School District, primarily Pioneer High.

Two middle schools are in the area (Katherine Edwards and Los Nietos) as are several elementary schools (Aeolian, Nelson, Phelan, Sorensen and West Whittier) In the state legislature West Whittier-Los Nietos is located in the 30th Senate District, represented by Democrat Bob Archuleta, and in the 57th Assembly District, represented by Democrat Lisa Calderon.

Federally, West Whittier-Los Nietos is located in California's 38th congressional district, which is represented by Democrat Linda Sánchez.