Mill Creek city, Washington Demographics & Population 2026

Population Overview

Mill Creek city is a small city located in Washington. The total population is 20,846. It ranks as the 72nd most populous out of 631 cities and towns in Washington.

Age Demographics

The median age in Mill Creek city is 38.8 years. This is 2% higher than the state median of 38.2 years.

Economy, Income & Housing

The median household income in Mill Creek city is $121,578. This is 28% higher than the state median of $94,952. Compared to the national median of $78,538, household income here is 55% higher. The poverty rate stands at 4.9%. This is 51% lower than the state poverty rate of 9.9%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 4.5%. This is 9% lower than the state rate of 5.0%. The median home value is $836,300. Housing costs are 61% higher than the state median of $519,800. The home-value-to-income ratio of 6.9x suggests that housing affordability is a significant concern for many residents. 59.8% of occupied housing units are owner-occupied. This homeownership rate is 6% lower than the state average of 63.9%.

Race & Ethnicity

The largest racial or ethnic group in Mill Creek city is White (non-Hispanic), making up 60.9% of the population. Asian residents account for 20.6%. The Asian population is significantly higher than the state average (20.6% vs 9.3%).

Education

53.7% of residents aged 25 and older hold a bachelor's degree or higher. This places Mill Creek city in the top 10% of all cities in the state for educational attainment. This is 39% higher 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 96.3%. Notably, 20.5% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Mill Creek city, 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.