Marietta-Alderwood, Washington

Marietta-Alderwood is a census-designated place (CDP) in Whatcom County, Washington, United States. The population was 3,906 at the 2010 census. Parts of Marietta-Alderwood were annexed into Bellingham in 2019, while the rest remains an unincorporated area.

Geography
Marietta-Alderwood is located at 48.78083°N, -122.54389°W (48.780895, -122.544015).

According to the United States Census Bureau, the CDP has a total area of 7.4 mi2, of which, 6.0 mi2 of it is land and 1.5 mi2 of it (19.54%) is water.

Climate
This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F. According to the Köppen Climate Classification system, Marietta-Alderwood has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps.

Demographics
As of the census of 2000, there were 3,594 people, 1,517 households, and 929 families residing in the CDP. The population density was 601.6 /sqmi. There were 1,606 housing units at an average density of 268.8 /sqmi. The racial makeup of the CDP was 84.20% White, 1.11% African American, 3.84% Native American, 5.04% Asian, 0.39% Pacific Islander, 2.84% from other races, and 2.59% from two or more races. Hispanic or Latino of any race were 5.98% of the population.

There were 1,517 households, out of which 28.7% had children under the age of 18 living with them, 45.5% were married couples living together, 11.6% had a female householder with no husband present, and 38.7% were non-families. 27.4% of all households were made up of individuals, and 6.8% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.90.

In the CDP, the age distribution of the population shows 23.0% under the age of 18, 12.2% from 18 to 24, 30.2% from 25 to 44, 23.8% from 45 to 64, and 10.8% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 101.1 males. For every 100 females age 18 and over, there were 97.9 males.

The median income for a household in the CDP was $39,902, and the median income for a family was $43,194. Males had a median income of $35,875 versus $27,167 for females. The per capita income for the CDP was $21,322. About 11.3% of families and 15.6% of the population were below the poverty line, including 25.5% of those under age 18 and 8.2% of those age 65 or over.