Mill Creek, Washington Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Mill Creek, Washington is 20,846 as of the 2023 American Community Survey, making it the 72nd-largest city in Washington. The median household income is $121,578, the median home value is $836,300, and the median age is 38.8.
The population has grown 14.9% since 2010 (18,267 → 20,993).
20,846
Population
4489
People / sq mi
$121,578
Median Income
$836,300
Median Home Value
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Mill Creek covers 4.6 sq mi of land at 4489 people per square mile.
About Mill Creek, WA
Remote work is unusually prominent in Mill Creek: 27.4% of workers primarily work from home, above the 14.0% national rate. With 20,846 residents, Mill Creek is a city in Washington.
Households take in a median $121,578, comfortably above the US median of $78,538. The poverty rate is 4.7%, below the national 12.4%. Real estate commands a premium here — a median home value of $836,300, with typical rent around $2,197.
College attainment is above the local norm at 53.7%, above the national 35.0%. An unusually large 27.4% of workers are remote, above the national 14.0%, and the average commute runs about 33 minutes each way.
The remote-work concentration is telling in Mill Creek — it skews toward higher-income, college-educated workers and reshapes both commute patterns and housing demand.
Mill Creek city Population History (2010-2024)
The city of Mill Creek city had a population of 18,267 in 2010 and 20,993 in 2024, a 14.9% growth over 14 years. The peak was 21,023 in 2021. Average annual growth rate: 1.01%.
20,993
Population (2024)
18,267
Population (2010)
21,023
Peak (2021)
1.01%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 18,267 |
| 2011 | 18,395 |
| 2012 | 18,600 |
| 2013 | 18,684 |
| 2014 | 19,068 |
| 2015 | 19,866 |
| 2016 | 20,155 |
| 2017 | 20,874 |
| 2018 | 20,977 |
| 2019 | 20,897 |
| 2020 | 20,912 |
| 2021 | 21,023 |
| 2022 | 20,938 |
| 2023 | 20,933 |
| 2024 | 20,993 |
Race & Ethnicity
| White | 64.0% |
| Black or African American | 4.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.1% |
| Two or More Races | 0.0% |
Economy & Income
$121,578
Median Household Income
$63,591
Per Capita Income
4.7%
Poverty Rate
3.1%
Unemployment Rate
Housing
$836,300
Median Home Value
$2,197
Median Rent
59.8%
Owner-Occupied
Education
96.3%
High School+
53.7%
Bachelor's+
Commute
4.8%
Drive Alone
57.8%
Public Transit
27.4%
Work From Home
32.9 min
Avg Commute
Community Profile
28.6%
Foreign Born
73.7%
Non-English at Home
4.9%
Veterans
9.6%
With Disability
97.0%
Health Insurance
98.2%
Internet Access
Employment by Industry
| Finance, Insurance & Real Estate | 22.4% |
| Professional, Scientific & Management | 20.1% |
| Manufacturing | 12.1% |
| Education, Health Care & Social Services | 8.0% |
| Information | 6.5% |
| Transportation & Warehousing | 3.5% |
| Public Administration | 3.4% |
| Construction | 3.3% |
| Retail Trade | 3.2% |
| Arts, Entertainment & Food Services | 3.0% |
| Agriculture & Mining | 0.3% |
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Frequently Asked Questions
Mill Creek, Washington has a population of 20,846 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 72nd-largest city in Washington.
The median household income in Mill Creek, Washington is $121,578, with 4.7% of residents living below the federal poverty level.
The median home value in Mill Creek, Washington is $836,300, with median monthly rent at $2,197 and a homeownership rate of 59.8%.
The median age in Mill Creek, Washington is 38.8 years. The population is 49.4% male and 50.6% female.
The population has grown 14.9% since 2010 (18,267 → 20,993).
Mill Creek city, WA Climate
Mill Creek city, WA has an average annual temperature of 10.6°C (51°F) and receives about 1108 mm of precipitation per year. The warmest month is August and the coldest is December. Figures are 1970–2000 climate normals.
10.6°C
Avg Temp
1108
Precip (mm/yr)
Aug
Hottest Month
Dec
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 4° / 40° | 139 mm |
| February | 6° / 42° | 106 mm |
| March | 7° / 45° | 114 mm |
| April | 10° / 49° | 87 mm |
| May | 13° / 55° | 68 mm |
| June | 15° / 60° | 57 mm |
| July | 18° / 64° | 34 mm |
| August | 18° / 65° | 37 mm |
| September | 15° / 59° | 59 mm |
| October | 11° / 51° | 96 mm |
| November | 6° / 44° | 153 mm |
| December | 4° / 39° | 158 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Mill Creek city, WA
The most comfortable months to visit Mill Creek city, WA are typically August, July and June, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 24°C high). The coldest is December (near 1°C low). December is usually the wettest month.
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Statewide data for Washington
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.