Mill Creek, Washington Demographics & Population 2026
During the 2020–2024 ACS period, Mill Creek, Washington had a total population of 20,956, the 72nd largest city in Washington, with a median household income of $124,364, which is 27% higher than the state average. The poverty rate is 6.4%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- 56.0% of adults hold a bachelor's degree or higher — top 10% in Washington.
- Housing affordability is a challenge — homes cost 7.3x the median household income.
Mill Creek Quick Facts
How Mill Creek Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 20,846 | 20,956 | +0.5% |
| Median household income | $121,578 | $124,364 | +2.3% |
| Median home value | $836,300 | $903,800 | +8.1% |
How Mill Creek Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A diverse community with significant representation from multiple racial and ethnic groups.
State average: 56 | National average: 61
Education
Educational Attainment (Adults 25+)
Mill Creek Rankings in Washington
Explore Washington Rankings
Other Cities in Snohomish County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Everett | 111,845 | $83,512 | 12.9% | $565,300 |
| Marysville | 73,002 | $103,974 | 8.1% | $567,900 |
| Edmonds | 42,735 | $122,449 | 3.8% | $890,100 |
| Lake Stevens | 40,253 | $122,336 | 5.2% | $635,600 |
| Lynnwood | 40,110 | $77,704 | 14.1% | $686,900 |
| Mill Creek East | 25,453 | $192,937 | 4.1% | $905,400 |
| Eastmont | 23,721 | $138,912 | 6.3% | $784,000 |
| North Lynnwood | 23,339 | $101,088 | 7.2% | $616,400 |
| Mountlake Terrace | 23,104 | $107,687 | 7.0% | $667,300 |
| Martha Lake | 22,634 | $124,494 | 8.3% | $785,400 |
Cities Similar to Mill Creek
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Mukilteo | 21,323 | $132,861 | $884,900 | 56.3% | 5.7% |
| Covington | 21,233 | $134,502 | $637,300 | 37.3% | 5.0% |
| Martha Lake | 22,634 | $124,494 | $785,400 | 50.2% | 8.3% |
| Five Corners | 21,194 | $106,192 | $459,600 | 25.7% | 8.6% |
| Silverdale | 20,685 | $105,483 | $555,300 | 36.3% | 6.2% |
Population Overview
Mill Creek is a small city located in Washington, within Snohomish County. The total population is 20,956. It ranks as the 72nd most populous out of 628 Census-designated places in Washington.
Age Demographics
The median age in Mill Creek is 39.3 years. This is 3% higher than the state median of 38.3 years.
Economy, Income & Housing
The median household income in Mill Creek is $124,364. This is 27% higher than the state median of $98,141. It is also 54% higher than the national median of $80,734. The poverty rate stands at 6.4%. This is 35% lower than the state poverty rate of 9.9%. The unemployment rate is 4.5%. This is 12% lower than the state rate of 5.1%. The median home value is $903,800. Housing costs are 60% higher than the state median of $564,600. The home-value-to-income ratio of 7.3x suggests that housing affordability is a significant concern for many residents. 59.0% of occupied housing units are owner-occupied. This homeownership rate is 7% lower than the state average of 63.8%.
Race & Ethnicity
The largest racial or ethnic group in Mill Creek is White (non-Hispanic), making up 61.3% of the population. Asian residents account for 20.3%. The Asian population is significantly higher than the state average (20.3% vs 9.7%).
Education
56.0% of residents aged 25 and older hold a bachelor's degree or higher. This places Mill Creek in the top 10% of all cities in the state for educational attainment. This is 41% higher than the state rate of 39.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.0%. Notably, 22.2% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Mill Creek, Washington is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Washington state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 628 Census-designated places in Washington. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
Free data download: Get all Washington city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of Mill Creek, Washington?
Mill Creek, Washington has a population of 20,956 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Mill Creek, WA?
The median household income in Mill Creek is $124,364, which is 54% higher than the national median of $80,734.
What is the poverty rate in Mill Creek, WA?
The poverty rate in Mill Creek is 6.4%. This means approximately 1,340 residents live below the federal poverty line.
What is the racial makeup of Mill Creek, Washington?
Mill Creek's population is 61.3% White, 3.2% Black, 8.6% Hispanic/Latino, and 20.3% Asian.
What is the median home value in Mill Creek, WA?
The median home value in Mill Creek is $903,800. The home-value-to-income ratio is 7.3x.
How educated is Mill Creek, Washington?
56.0% of adults (25+) in Mill Creek hold a bachelor's degree or higher, and 22.2% hold a graduate or professional degree.