Maple Valley, WA Profile: Facts & Data


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Maple Valley, Washington - Basic Facts

The City of Maple Valley had a population of 27,491 as of July 1, 2020. Maple Valley ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Washington. See peer rankings below.

The primary coordinate point for Maple Valley is located at latitude 47.3927 and longitude -122.0464 in King County. The formal boundaries for the City of Maple Valley encompass a land area of 5.73 sq. miles and a water area of 0.18 sq. miles. King County is in the Pacific time zone (GMT -8). The elevation is 420 feet.

The City of Maple Valley (GNIS ID: 2411028) 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 Maple Valley is located within Tahoma-Maple Valley Division of King County.

Alternate Unofficial Names for Maple Valley: Maplevalley.


Maple Valley, WA Data & Demographics (As of July 1, 2020)


Total Population 27,491 (100%)
Population in Households 27,491 (100.0%)
Population in Families 24,614 (89.5%)
Population in Group Quarters1 0
Population Density 4,579
Diversity Index2 42


Median Household Income $115,063
Average Household Income $141,612
% of Income for Mortgage4 16%
Per Capita Income $47,159
Wealth Index5 178


Total HU (Housing Units) 9,323 (100%)
Owner Occupied HU 7,629 (81.8%)
Renter Occupied HU 1,470 (15.8%)
Vacant Housing Units 224 ( 2.4%)
Median Home Value $451,307
Average Home Value $520,672
Housing Affordability Index3 140


Total Households 9,099
Average Household Size 3.02
Family Households 7,345
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population 2.01% 1.71%
Households 1.77% 1.56%
Families 1.84% 1.63%
Median Household Income   2.1%
Per Capita Income   2.56%
Owner Occupied HU   1.67%


Maple Valley, WA - Peer Comparisons by Rank and Percentile

The table below compares Maple Valley to the other 625 incorporated cities, towns and CDPs in Washington by rank and percentile using July 1, 2020 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 # 45 93rd
Population Density # 28 96th
Median Household Income # 52 92nd
Housing Affordability Index # 382 61st
Per Capita Income # 103 84th
Diversity Index # 263 58th

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

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