Mill Creek Flag

Mill Creek

County Seat:
No
Area (mi²):
4.644
State:
Washington

Mill Creek is a city located in Snohomish County, Washington. Mill Creek has a 2026 population of 20,907. Mill Creek is currently growing at a rate of 0.02% annually but its population has decreased by -0.01% since the most recent census, which recorded a population of 20,909 in 2020.

The median household income in Mill Creek is $124,364 with a poverty rate of 6.42%. The median age in Mill Creek is 39.3 years: 38.3 years for males, and 40 years for females. For every 100 females there are 100.7 males.

20.9K
Total Population
4,502
Density (mi²)
5 0.02%
Growth

Mill Creek Population

Mill Creek Population

Year ↓
Population
Growth
Annual Change
202620,90750.02%
202520,902-30-0.14%
202420,932410.2%
202320,891-34-0.16%
202220,925-98-0.47%
202121,0231140.55%
202020,909-23-0.11%
201920,904-97-0.46%
201821,0011020.49%
201720,8997243.59%
201620,1753011.51%
201519,8748024.21%
201419,0723832.05%
201318,689850.46%
201218,6042101.14%
201118,3941260.69%
201018,268240.13%
200011,5254,35360.69%
19907,17200%

Median Age

Overall: 39.3 years
Female: 40 years
Male: 38.3 years

Mill Creek Adults

There are 16,510 adults, (3,141 of whom are seniors) in Mill Creek.

Sex Ratio

Female: 10,440 (49.8%)
Male: 10,516 (50.2%)

Demographics

The racial composition of Mill Creek includes 65.1% White, 20.41% Asian, 3.43% Black or African American, and smaller percentages for other race, Native Hawaiian or Pacific Islander, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White13,64365.1%
Asian4,27820.41%
Two or more races1,6888.05%
Black or African American7193.43%
Other race3721.78%
Native Hawaiian or Pacific Islander2211.05%
Native American350.17%
Race
Population ↓
Percentage (of total)
White8073.85%
Two or more races5612.68%
Other race3721.78%
Black or African American450.21%
Asian180.09%
Race
Population ↓
Percentage (of total)
White12,83661.25%
Asian4,26020.33%
Two or more races1,1275.38%
Black or African American6743.22%
Native Hawaiian or Pacific Islander2211.05%
Native American350.17%

Mill Creek Marital Status

Economics and Income Statistics

Mill Creek's average per capita income is $86,900. Household income levels show a median of $124,364. The poverty rate stands at 6.42%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Married Families$172,542-
Families$163,109$204,244
Households$124,364$164,650
Non Families$79,706$90,752

$86,900

Average Income

$124,364

Median Household Income

6.42%

Poverty Rate

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)