Rock Island

County:: Douglas County
County Seat:: No
Area (mi²):: 1.127
State:: Washington

Rock Island is a city located in Douglas County, Washington. Rock Island has a 2025 population of 1,829. Rock Island is currently growing at a rate of 6.28% annually and its population has increased by 41.89% since the most recent census, which recorded a population of 1,289 in 2020.

The average household income in Rock Island is $64,666 with a poverty rate of 9.36%.The median age in Rock Island is 36.4 years: 39.5 years for males, and 35.1 years for females.

Demographics

The racial composition of Rock Island includes 50.88% White, 36.43% other race, and smaller percentages for Black or African American, Native American and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	581	50.88%
Other race	416	36.43%
Two or more races	117	10.25%
Black or African American	23	2.01%
Native American	5	0.44%

Rock Island Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Rock Island's average per capita income is $34,922. Household income levels show a median of $55,114. The poverty rate stands at 9.36%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$78,056	-
Families	$59,643	$69,829
Households	$55,114	$64,666
Non Families	$40,444	$44,851

$34,922

Average Income

$55,114

Median Household Income

9.36%

Poverty Rate