Mill Creek, Snohomish County, WA demographics:
population, income, and more

Total population
20,956
0.5% year-over-year change
Median household income
$124,364/yr
2.3% year-over-year change
Housing units
9,224
0.8% year-over-year change

Mill Creek population

How many people live in Mill Creek

Mill Creek is home to 20,956 residents, according to the most recent Census data. Gender-wise, 50.2% of Mill Creek locals are male, and 49.8% are female.

Total population
20,956
0.5% year-over-year change
Gender ratio
Male
50.2%
10,516
Female
49.8%
10,440
Value Percent YoY change
Male 10,516 50.2% 2.2%
Female 10,440 49.8% -1.1%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Mill Creek is 39, with the population distributed as follows: about 17.4% are children under 15, then 11.6% are in the 15 to 24 age group. Adults between 25 and 44 make up 29.7% of the population, while another 26.4% fall into the 45 to 64 bracket. Finally, around 15% are 65 or older.

Median age
39.3
Age breakdown
Under 15
17.4%
15 to 24
11.6%
25 to 44
29.7%
45 to 64
26.4%
Over 65
15%
Value Percent YoY change
Under 15 3,635 17.4% -3.5%
15 to 24 2,440 11.6% 5.5%
25 to 44 6,215 29.7% 1.2%
45 to 64 5,525 26.4% 0.6%
Over 65 3,141 15% 0.2%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Mill Creek, 73.9% of the population are US-born citizens, while 13.6% have gained naturalized citizenship. At the same time, 12.5% of residents are non-citizens. As for race, 65.1% of locals are Caucasian, 3.4% are African American and 20.4% have Asian roots. Another 0.2% are Indigenous American, 1% are Pacific Islanders, while 1.8% identify as another race. There’s also a share of 8% that includes residents with two or more races.

Citizenship
U.S.-born citizens
73.9%
Non-U.S.-born citizens
13.6%
Non-citizens
12.5%
Value Percent YoY change
U.S.-born citizens 15,493 73.9% 1.2%
Non-U.S.-born citizens 2,844 13.6% -4.0%
Non-citizens 2,619 12.5% 1.6%
Racial breakdown
White
65.1%
Black or African American
3.4%
American Indian and Alaska Native
0.2%
Asian
20.4%
Native Hawaiian and other Pacific Islander
1%
Two or more races
8%
Other
1.8%
Value Percent
White 13,643 65.1%
Black or African American 719 3.4%
American Indian and Alaska Native 35 0.2%
Asian 4,278 20.4%
Native Hawaiian and other Pacific Islander 221 1%
Two or more races 1,688 8%
Other 372 1.8%

Households in Mill Creek

A peek inside Mill Creek households

Mill Creek has 8,682 households, with an average of 2 members in each. Of these, 62.9% are families, while the remaining 37.1% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
8,682
2.5% year-over-year change
Average people per household
2
Non-family households
3,220
Family households
5,462
Value Percent YoY change
Non-family households 3,220 37.1% 6.1%
Family households 5,462 62.9% 0.4%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Mill Creek

The housing landscape of Mill Creek

Mill Creek's housing consists of 9,224 units, with 51.3% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 7.7% and offer a more compact, shared living style.

Housing units
9,224
0.8% year-over-year change
Housing types
Value Percent
1 unit, detached 4,732 51.3%
1 unit, attached 714 7.7%
2 units 59 0.6%
3 or 4 units 168 1.8%
5 to 9 units 459 5%
10 to 19 units 1,345 14.6%
20 to 49 units 946 10.3%
50 or more units 798 8.6%
Mobile home 3 0%
Homes built since 2020
96
6.7% year-over-year change

The age of buildings in Mill Creek

In Mill Creek, the median construction year is 1995. About 0.9% of homes were built before the 1940s, with another 0.1% going up by 1949. Most development happened in the second half of the 20th century. Then, 22.6% of homes were added from 2000 to 2009, 14.6% between 2010 and 2019, and 1% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 79 0.9% N/A
Built between 1940 and 1949 10 0.1% 0.0%
Built between 1950 and 1959 19 0.2% -40.6%
Built between 1960 and 1969 130 1.4% -39.5%
Built between 1970 and 1979 1,131 12.3% 7.5%
Built between 1980 and 1989 2,138 23.2% -2.9%
Built between 1990 and 1999 2,193 23.8% -1.8%
Built between 2000 and 2009 2,082 22.6% -2.7%
Built between 2010 and 2019 1,346 14.6% 14.2%
Built in 2020 or later 96 1% 6.7%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Mill Creek occupancy rates

Out of the 8,682 occupied housing units in Mill Creek, 59% are owner-occupied, while 41% are lived in by tenants. Meanwhile, 5.9% of all homes on the local market sit vacant.

Occupied housing units
8,682
2.5% year-over-year change
Occupancy breakdown
Renter occupied
3,558
Owner occupied
5,124
Value Percent YoY
change
Renter occupied 3,558 41% 4.4%
Owner occupied 5,124 59% 1.2%
Unoccupied housing units
5.9%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Mill Creek housing costs

Housing costs in Mill Creek come to a median of $2,345 per month, while tenants specifically pay a median gross rent of $2,249.

Median housing costs per month
$2,345/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Mill Creek
$2,249/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Mill Creek

Mill Creek education at a glance

About 17.8% of the population in Mill Creek went to high school, while 19.2% pursued college studies. Another 9.3% earned an associate degree and 31.6% hold a bachelor’s. Meanwhile, 20% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 338 2% 41.4%
High school diploma 2,934 17.8% 3.9%
College diploma 3,170 19.2% -10.5%
Associate degree 1,534 9.3% -3.0%
Bachelor's degree 5,225 31.6% 2.5%
Graduate degree 3,309 20% 9.2%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Mill Creek

How much people earn in Mill Creek

The average annual household income in Mill Creek was $164,650 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +5.3% change from the previous year. At the same time, the median income stood at $124,364, reflecting a +2.3% shift over the same period.

Average household income in Mill Creek
$164,650/year
5.3% year-over-year change
Median household income in Mill Creek
$124,364/year
2.3% year-over-year change

Mill Creek income by age

In Mill Creek, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $133,487. Those with someone between 45 and 64 in charge, often well established professionally, earn $162,830 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $110,909, while those led by someone over 65, many of whom may be retired, have about $70,552 in earnings. Overall, 93.5% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $110,909 43.4%
25 - 44 $133,487 -3.1%
45 - 64 $162,830 7.8%
Over 65 $70,552 -7.4%
Above poverty level
19,270
Below poverty level
1,340
Value Percent YoY
change
Above poverty level 19,270 93.5% -0.5%
Below poverty level 1,340 6.5% 32.0%

Average renter income in Mill Creek

To get a better sense of what renters earn on average in Mill Creek, their median household income was $82,163 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 32.8%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$82,163
Rent-to-income ratio
32.8%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Mill Creek

Workforce and job types in Mill Creek

The job market in Mill Creek is powered by 11,151 working residents, spread across a range of industries and roles. 89% of the working population are employed in professional or administrative positions, while 11% are in hands-on or service-based jobs. Also, 7.8% run their own businesses, 75.2% are employed by private companies, and 11.8% work in the public sector.

Workforce demographics

Working population
11,151
2.0% year-over-year change
White collar
9,922
Blue collar
1,229
Value Percent YoY change
White collar 9,922 89% 2.7%
Blue collar 1,229 11% -3.5%
Employer type
Self employees
7.8%
Private companies
75.2%
Governmental workers
11.8%
Not for profit companies
5.3%
Value Percent YoY change
Self employees 868 7.8% -13.8%
Private companies 8,385 75.2% 4.2%
Governmental workers 1,310 11.8% -2.7%
Not for profit companies 588 5.3% 11.6%
Unemployment rate
4.5%
0.8% year-over-year change

Available workforce

The unemployment rate in Mill Creek stands at 4.5%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Mill Creek

How people get around in Mill Creek

Commuting methods vary: 64.2% of residents travel by personal vehicle and 0.3% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 7,189 64.2% 0.0%
Bus or trolleybus 493 4.4% -5.6%
Motorcycle 69 0.6% -14.8%
Bicycle 19 0.2% -17.4%
Walk 29 0.3% -14.7%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Mill Creek by zipcode?

Zipcode Population Number of households Median income Average income
98012 77,041 27,903 $146,144 $177,969

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FAQs about Mill Creek demographics 

What is the total population of Mill Creek?

Mill Creek has a total population of 20,956 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +0.5% compared to a year ago.

What is the gender ratio in Mill Creek?

The gender ratio in Mill Creek is as follows:
  • 50.2% males (10,516 residents)
  • 49.8% females (10,440 residents)

What is the median age in Mill Creek?

The median age in Mill Creek is 39.3.

What is the age distribution of the population in Mill Creek?

The age distribution in Mill Creek is as follows:
  • Under 15: 17.4% (3,635 residents)
  • Ages 15-24: 11.6% (2,440 residents)
  • Ages 25-44: 29.7% (6,215 residents)
  • Ages 45-64: 26.4% (5,525 residents)
  • Over 65: 15% (3,141 residents)

What is the racial and ethnic makeup of Mill Creek?

The racial and ethnic makeup of Mill Creek is as follows:
  • White: 65.1% (13,643 residents)
  • Black or African American: 3.4% (719 residents)
  • American Indian and Alaska Native: 0.2% (35 residents)
  • Asian: 20.4% (4,278 residents)
  • Native Hawaiian and Other Pacific Islander: 1% (221 residents)
  • Two or More Races: 8% (1,688 residents)
  • Other: 1.8% (372 residents)

What percentage of the population in Mill Creek are U.S.-born citizens?

U.S.-born citizens represent 73.9% of the population in Mill Creek.

How many housing units are there in Mill Creek?

There are 9,224 housing units in Mill Creek, reflecting a +0.8% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Mill Creek and what is the average household size?

Mill Creek has a total of 8,682 households, with an average of 2 people in each.

What is the median household income in Mill Creek?

Mill Creek has a median household income of $124,364, representing a +2.3% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Mill Creek?

The employment rate is 95.5% in Mill Creek, with a workforce of 11,151 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 89% (9,922 residents)
  • Blue-collar workers: 11% (1,229 residents)

Places of employment:
  • Self-employed: 7.8% (868 residents)
  • Private companies: 75.2% (8,385 residents)
  • Governmental workers: 11.8% (1,310 residents)
  • Not-for-profit companies: 5.3% (588 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025