City · Washington
Mill Creek, Washington
Mill Creek, city, in Snohomish County, Washington. Mill Creek had 20,902 residents on July 1, 2025 by the Census Bureau's estimate, down 0.1% since 2020; the 2020 Census counted 20,926 and the ACS 2020-2024 5-year estimates put it at 20,956 (±35). GEOID 5345865.
Residents, July 2025 estimate
20,902
Census Bureau estimate (no margin published)
2020 Census count: 20,926 · ACS 2020-2024: 20,956 ±35
Median household income
$124,364
±$11,276 (90% margin)
Washington: $98,141
Median home value
$903,800
±$24,138 (90% margin)
Washington: $564,600
Median gross rent
$2,249
±$88 (90% margin)
Washington: $1,760
Where is Mill Creek and what county is it in?
Mill Creek is a city in Snohomish County, Washington. It covers 4.6 square miles of land, 4,506 residents per square mile in 2020.
Mill Creek is in the Seattle-Tacoma-Bellevue, WA metropolitan statistical area, which takes in 3 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Mill Creek, and is it growing?
The Census Bureau estimates that 20,902 people lived in Mill Creek on July 1, 2025, down 0.1% since 2020, while Washington grew 3.8%. The 2020 Census counted 20,926 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 20,956 (±35).
| Measure | Mill Creek | Snohomish County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 20,956 ±35 | 844,430 | +403 |
| Households | 8,682 ±432 | 316,212 | no clear change |
| Average household size | 2.41 ±0.12 | 2.64 | no clear change |
| Housing units | 9,224 ±459 | 331,530 | no clear change |
Mill Creek's population since 2000
From 11,525 in 2000 to 20,902 in 2025: up 81.4%. The 2000, 2010 and 2020 figures are census counts, each for Mill Creek as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Mill Creek?
The median resident of Mill Creek is 39.3 years old; 21.2% are under 18 and 15.0% are 65 or older. The largest group is non-Hispanic white residents at 61.3%, then non-Hispanic Asian residents at 20.3%. 24.5% of residents were born outside the United States.
| Measure | Mill Creek | Snohomish County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.3 ±1.1 | 38.6 | no clear change |
| Under 18 years | 21.2% ±2.4 pts | 22.1% | – |
| 65 years and over | 15.0% ±2.5 pts | 14.8% | – |
| Male | 50.2% ±2.1 pts | 50.4% | – |
| Hispanic or Latino (any race) | 8.6% ±2.8 pts | 12.1% | no clear change |
| White alone, not Hispanic | 61.3% ±4.5 pts | 62.0% | no clear change |
| Black or African American alone, not Hispanic | 3.2% ±1.3 pts | 3.6% | no clear change |
| Asian alone, not Hispanic | 20.3% ±3.3 pts | 13.6% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.1 pts | 0.6% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 1.1% ±0.7 pts | 0.5% | – |
| Two or more races, not Hispanic | 5.4% ±1.6 pts | 6.9% | – |
| Some other race alone, not Hispanic | 0.0% ±0.2 pts | 0.7% | – |
| Born outside the United States | 24.5% ±3.9 pts | 19.3% | +5.8 pts |
| Speak a language other than English at home (age 5+) | 24.3% ±4.0 pts | 24.4% | – |
| Civilian veterans (age 18+) | 5.0% ±1.2 pts | 6.9% | – |
| With a disability | 9.1% ±3.7 pts | 12.4% | – |
| No health insurance coverage | 3.1% ±1.0 pts | 6.2% | no clear change |
| High school graduate or higher (age 25+) | 96.0% ±2.0 pts | 93.1% | – |
| Bachelor's degree or higher (age 25+) | 56.0% ±4.5 pts | 38.2% | no clear change |
| Graduate or professional degree (age 25+) | 22.2% ±3.4 pts | 13.4% | – |
| Lived in the same house a year earlier | 85.2% ±3.5 pts | 87.3% | – |
| Moved from another state in the past year | 3.5% ±1.9 pts | 1.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Mill Creek earn?
Half of Mill Creek's 8,682 households earn less than $124,364 a year (±$11,276), against $111,246 in Snohomish County and $98,141 in Washington. In 2015-2019 it was $127,684 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.4% of residents live below the poverty line.
| Measure | Mill Creek | Snohomish County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $124,364 ±$11,276 | $111,246 | no clear change |
| Mean household income | $164,650 ±$11,364 | $142,821 | – |
| Per capita income | $68,073 ±$5,046 | $54,628 | no clear change |
| People below the poverty line | 6.4% ±2.7 pts | 8.0% | no clear change |
| Children under 18 below the poverty line | 7.9% ±6.5 pts | 9.2% | – |
| Households receiving SNAP | 6.1% ±2.1 pts | 8.8% | – |
| Households with a computer | 98.1% ±1.3 pts | 97.7% | – |
| Households with a broadband subscription | 96.6% ±1.5 pts | 94.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Mill Creek?
Owners occupy 59.0% of Mill Creek's occupied homes and renters 41.0%. The median owner-occupied home is valued at $903,800 by its owner (±$24,138). The median renter pays $2,249 a month including utilities, and 42.7% of renters pay 35% or more of their income on rent.
| Measure | Mill Creek | Snohomish County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $903,800 ±$24,138 | $696,000 | +$243,164 |
| Median gross rent | $2,249 ±$88 | $1,949 | no clear change |
| Renters paying 35% or more of income on rent | 42.7% ±9.5 pts | 41.9% | +13.2 pts |
| Median monthly owner costs, with a mortgage | $3,306 ±$296 | $2,748 | – |
| Owner-occupied homes | 59.0% ±4.6 pts | 68.2% | no clear change |
| Renter-occupied homes | 41.0% ±4.6 pts | 31.8% | – |
| Housing units | 9,224 ±459 | 331,530 | no clear change |
| Homeowner vacancy rate | 0.8% ±1.3 pts | 0.5% | – |
| Rental vacancy rate | 4.4% ±3.8 pts | 4.0% | – |
| Single-family detached homes | 51.3% ±4.2 pts | 63.9% | – |
| Mobile homes | 0.0% ±0.1 pts | 4.6% | – |
| Built 2020 or later | 1.0% ±0.8 pts | 2.6% | – |
| Built 2010 to 2019 | 14.6% ±3.6 pts | 12.2% | – |
| Built 1939 or earlier | 0.9% ±1.3 pts | 4.9% | – |
| Households with no vehicle | 4.6% ±1.9 pts | 4.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Mill Creek building?
Builders took permits for 0 new housing units in Mill Creek in 2025 (0 in single-family houses), 0.0 per 1,000 residents against 4.4 across Washington.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Mill Creek work and get to work?
56.9% of Mill Creek's workers drive alone and 29.9% work from home. The average trip to work takes 33.0 minutes. The unemployment rate in 2020-2024 averaged 4.5%.
| Measure | Mill Creek | Snohomish County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 69.5% ±2.8 pts | 67.3% | – |
| Unemployment rate | 4.5% ±2.0 pts | 4.5% | no clear change |
| Drove alone to work | 56.9% ±4.8 pts | 65.0% | – |
| Carpooled | 7.4% ±2.7 pts | 9.1% | – |
| Public transportation | 4.4% ±2.0 pts | 2.8% | – |
| Walked | 0.3% ±0.3 pts | 1.6% | – |
| Worked from home | 29.9% ±3.4 pts | 20.0% | +22.3 pts |
| Mean travel time to work | 33.0 min ±2.4 | 30.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Mill Creek?
5 census tracts lie mostly in Mill Creek, and 3 more reach into it (2020 census blocks). Their median household incomes run from $98,994 (Tract 417.04) to $163,886 (Tract 520.06).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 520.04Snohomish County | 7,057 | $146,685 |
| Tract 520.05Snohomish County | 5,849 | $128,623 |
| Tract 417.04Snohomish County | 6,026 | $98,994 |
| Tract 520.08Snohomish County | 4,604 | $147,356 |
| Tract 520.06Snohomish County | 4,125 | $163,886 |
| Tract 519.33Snohomish County | 4,870 | $126,500 |
| Tract 519.27Snohomish County | 6,397 | $171,971 |
| Tract 416.09Snohomish County | 3,958 | $127,716 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Mill Creek) · Census block assignment files
How does Mill Creek compare with other places in Washington?
By the Census Bureau's July 2025 estimates, Mill Creek is the 1,867th-most populous of the 19,476 U.S. incorporated places that have one and the 57th-most populous of 281 in Washington.
Mill Creek ranks 88th of 387 places in Washington with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 57th | 281 |
| Growth 2020-2025 (PEP) | 162nd | 203 |
| Residents per square mile | 30th | 394 |
| Median household income | 88th | 387 |
| Per capita income | 56th | 393 |
| Median home value | 34th | 384 |
| Median gross rent | 55th | 351 |
| Poverty rate | 207th | 281 |
| Bachelor's degree or higher | 36th | 382 |
| Median age | 202nd | 394 |
| Owner-occupied share | 302nd | 388 |
| Work from home | 38th | 307 |
| Travel time to work | 74th | 394 |
Mill Creek's figures with every place in Washington (CSV)
Every place in Washington, sortable · Compare Mill Creek with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Mill Creek?
8 of the 57 figures for Mill Creek on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Mill Creek are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Mill Creek.