Mountlake Terrace, WA Profile: Facts, Map & Data


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Mountlake Terrace, Washington - Basic Facts

The City of Mountlake Terrace had a population of 21,157 as of July 1, 2017. Mountlake Terrace ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Washington. See peer rankings below.

The primary coordinate point for Mountlake Terrace is located at latitude 47.7943 and longitude -122.3026 in Snohomish County. The formal boundaries for the City of Mountlake Terrace (see map below) encompass a land area of 4.06 sq. miles and a water area of 0.11 sq. miles. Snohomish County is in the Pacific time zone (GMT -8). The elevation is 459 feet.

The City of Mountlake Terrace (GNIS ID: 2411187) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Washington is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Mountlake Terrace is located within Edmonds Division of Snohomish County.

Beneath the boundary map are tables with Mountlake Terrace population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of Mountlake Terrace, WA Boundary Map

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Mountlake Terrace, WA Data & Demographics (As of July 1, 2017)


Total Population 21,157
Daytime Population: Workers 7,222
Daytime Population: Residents 9,676
Total Daytime Population (TDP) 16,898
Ratio TDP/Total Population1 0.80
Population in Households 21,041
Population in Familes 15,671
Population in Group Qrtrs 116
Population Density2 5,215
Diversity Index3 63


Median Household Income $59,021
Average Household Income $71,753
Per Capita Income $29,540


Total Housing Units 9,066 (100%)
Owner Occupied HU 5,185 (57.2%)
Renter Occupied HU 3,503 (38.6%)
Vacant Housing Units 377 ( 4.2%)
Median Home Value $287,145
Average Home Value $316,868


Total Households 8,689
Average Household Size 2.42
Family Households 5,164
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.84% 1.03%
Households 0.82% 1.01%
Families 0.75% 0.95%
Median Household Income   2.15%
Per Capita Income   2.46%

Mountlake Terrace, WA - Peer Comparisons by Rank and Percentile

The table below compares Mountlake Terrace to the other 627 incorporated cities, towns and CDPs in Washington by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 60 91st
Population Density # 9 99th
Diversity Index # 96 85th
Median Household Income # 280 56th
Per Capita Income # 286 55th

Additional comparisons and rankings can be made with a VERY EASY TO USE Washington Census Data Comparison Tool.

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