Mountlake Terrace, Washington Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Mountlake Terrace, Washington is 21,419 as of the 2023 American Community Survey, making it the 66th-largest city in Washington. The median household income is $101,404, the median home value is $606,100, and the median age is 38.2.
The population has grown 26.6% since 2010 (19,907 → 25,198).
21,419
Population
5281
People / sq mi
$101,404
Median Income
$606,100
Median Home Value
Mountlake Terrace covers 4.1 sq mi of land at 5281 people per square mile.
About Mountlake Terrace, WA
Mountlake Terrace is a city in Washington with a population of 21,419. It ranks #66 among cities in Washington by population. The median age is 38.2, in line with the national median. The population is 48.9% male and 51.1% female.
The median household income in Mountlake Terrace is $101,404, above the US median of $74,580. 4.5% of residents live below the federal poverty level. Home values sit at a median of $606,100, with monthly rent averaging $1,966. The homeownership rate of 56.1% is lower than the national rate of 64.8%.
Educational attainment in Mountlake Terrace reflects 41.9% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 22.6% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 31.0 minutes each way.
Mountlake Terrace city Population History (2010-2024)
The city of Mountlake Terrace city had a population of 19,907 in 2010 and 25,198 in 2024, a 26.6% growth over 14 years. The peak was 25,198 in 2024. Average annual growth rate: 1.71%.
25,198
Population (2024)
19,907
Population (2010)
25,198
Peak (2024)
1.71%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 19,907 |
| 2011 | 19,975 |
| 2012 | 20,135 |
| 2013 | 20,578 |
| 2014 | 20,722 |
| 2015 | 20,880 |
| 2016 | 21,120 |
| 2017 | 21,347 |
| 2018 | 21,368 |
| 2019 | 21,338 |
| 2020 | 21,286 |
| 2021 | 22,324 |
| 2022 | 22,883 |
| 2023 | 23,771 |
| 2024 | 25,198 |
Race & Ethnicity
| White | 62.9% |
| Black or African American | 3.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.4% |
| Two or More Races | 0.0% |
Economy & Income
$101,404
Median Household Income
$55,374
Per Capita Income
4.5%
Poverty Rate
3.3%
Unemployment Rate
Housing
$606,100
Median Home Value
$1,966
Median Rent
56.1%
Owner-Occupied
Education
93.9%
High School+
41.9%
Bachelor's+
Commute
4.2%
Drive Alone
61.9%
Public Transit
22.6%
Work From Home
31.0 min
Avg Commute
Community Profile
33.4%
Foreign Born
75.8%
Non-English at Home
5.8%
Veterans
14.3%
With Disability
92.8%
Health Insurance
96.3%
Internet Access
Employment by Industry
| Finance, Insurance & Real Estate | 22.1% |
| Professional, Scientific & Management | 20.3% |
| Construction | 9.7% |
| Education, Health Care & Social Services | 8.5% |
| Manufacturing | 6.9% |
| Information | 4.3% |
| Arts, Entertainment & Food Services | 4.1% |
| Retail Trade | 3.4% |
| Public Administration | 3.4% |
| Transportation & Warehousing | 1.9% |
| Agriculture & Mining | 1.5% |
Largest cities in Washington
Largest counties in Washington
Part of Washington
Metro areas in Washington
City rankings
Frequently Asked Questions
Mountlake Terrace, Washington has a population of 21,419 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 66th-largest city in Washington.
The median household income in Mountlake Terrace, Washington is $101,404, with 4.5% of residents living below the federal poverty level.
The median home value in Mountlake Terrace, Washington is $606,100, with median monthly rent at $1,966 and a homeownership rate of 56.1%.
The median age in Mountlake Terrace, Washington is 38.2 years. The population is 48.9% male and 51.1% female.
The population has grown 26.6% since 2010 (19,907 → 25,198).
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Statewide data for Washington
Population, race, income, age, and trends across Washington
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.