Cowlitz County WA Information


Cowlitz County Subdivisions

Cowlitz County WA Data & Demographics (As of July 1, 2021)


Total Population 111,095 (100%)
Population in Households 109,888 (98.9%)
Population in Families 87,521 (78.8%)
Population in Group Quarters1 1,207 ( 1.1%)
Population Density 97
Diversity Index2 39


Median Household Income $55,905
Average Household Income $73,423
% of Income for Mortgage4 23%
Per Capita Income $28,907
Wealth Index5 78


Total HU (Housing Units) 46,779 (100%)
Owner Occupied HU 31,146 (66.6%)
Renter Occupied HU 12,540 (26.8%)
Vacant Housing Units 3,093 ( 6.6%)
Median Home Value $306,914
Average Home Value $360,429
Housing Affordability Index3 98


Total Households 43,686
Average Household Size 2.52
Family Households 29,329
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.


2010-2021 2021-2026
Population 0.73% 0.66%
Households 0.73% 0.67%
Families 0.66% 0.63%
Median Household Income   2.39%
Per Capita Income   2.8%
Owner Occupied HU   1.09%


Cowlitz County WA - Peer Comparisons by Rank and Percentile

The table below compares Cowlitz County to the other 39 counties and county equivalents in Washington by rank and percentile using July 1, 2021 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 # 12 72nd
Population Density # 12 72nd
Median Household Income # 27 33rd
Housing Affordability Index # 11 28th
Per Capita Income # 29 28th
Diversity Index # 26 36th

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

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