Marietta-Alderwood CDP, Washington Demographics & Population 2026

Population Overview

Marietta-Alderwood CDP is a small community located in Washington. The total population is 3,569. It ranks as the 233rd most populous out of 631 cities and towns in Washington.

Age Demographics

The median age in Marietta-Alderwood CDP is 40.5 years. This is 6% higher than the state median of 38.2 years.

Economy, Income & Housing

The median household income in Marietta-Alderwood CDP is $62,243. This is 34% lower than the state median of $94,952. Compared to the national median of $78,538, household income here is 21% lower. The poverty rate stands at 12.6%. This is 28% higher than the state poverty rate of 9.9%. The unemployment rate is 2.1%. This is 57% lower than the state rate of 5.0%. The median home value is $493,200. Housing costs are 5% lower than the state median of $519,800. The home-value-to-income ratio of 7.9x suggests that housing affordability is a significant concern for many residents. 49.3% of occupied housing units are owner-occupied. This homeownership rate is 23% lower than the state average of 63.9%.

Race & Ethnicity

The largest racial or ethnic group in Marietta-Alderwood CDP is White (non-Hispanic), making up 68.6% of the population. Hispanic or Latino residents account for 11.2%. The Asian population (4.3%) is well below the state average of 9.3%.

Education

33.1% of residents aged 25 and older hold a bachelor's degree or higher. This is 15% lower than the state rate of 38.8%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.8%.

Data Sources & Methodology

All demographic data for Marietta-Alderwood CDP, Washington is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Washington state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 631 Census-designated places in Washington. For official data, visit data.census.gov.