Duluth is a census-designated place (CDP) in Clark County, Washington, United States. The population was 1,544 at the 2020 census.

The community is located 11 miles (18 km) north of downtown Vancouver, Washington, with access from Exit 11 on Interstate 5.

Adolph Sauvie opened a store and a bus depot on 219th street and 10th avenue. The bus company wanted the place to have a name, and Adolph named it after Duluth, Minnesota, his hometown.

Historical population

Census	Pop.	Note	%±
1990	1,020		—
2000	1,424		39.6%
2010	1,544		8.4%
2020	1,718		11.3%
U.S. Decennial Census 2020 Census

As of the census of 2020, there were 1,718 people, 577 housing units, and 575 families living in the CDP. There were 1,443 White people, 3 African Americans, 16 Native Americans, 49 Asians, 52 people from some other race, and 155 people from two or more races.

The ancestry in Duluth was 13.7% Irish, 12.2% English, 11.1% German, 5.4% French, 3.5% Sub-Saharan African, 2.7% Norwegian, 1.2% Italian, and 0.9% Polish.

The median age was 54.7 years old. 25.8% of the population were 65 or older, with 9.8% between the ages of 65 to 74, 10.3% between the ages of 75 to 84, and 5.7% 85 or older. 6.5% of the population was foreign born.

The median household income was $63,981, with families having $87,625, married couples having $101,500, and non-families having $48,750. 18.9% of the population were in poverty.