Rock Island, WA population, income and ZIP codes

Rock Island city is a small town in Washington, with 1,142 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #380 of 639 ranked by population — larger than 40% of them. The median age here is 36.4 years against 39.1 nationally, a slightly younger profile than the country as a whole. At this population the ACS sample is small, so the margin of error around every dollar figure below is wide — treat the numbers as a band, not a point, and expect them to move between annual releases without the place itself changing.

Households in Rock Island city earn a median of $55,114 a year, 29.8% below the national figure of $78,538 and 39% below the $90,592 median for the 393 Washington cities we cover. Median household income counts every pre-tax dollar arriving at an address — wages, self-employment, Social Security, pensions, interest and public assistance — for everyone living there, so multi-earner households pull the figure up even where individual pay is modest. Poverty reaches 9.4% of residents here, below the 12.4% national rate.

The typical owner-occupied home in Rock Island city is valued at $255,500, 15.8% below the national figure and 45% below the $468,400 peer median, while median gross rent runs $1,094 a month, 22.2% below the national figure, or roughly $13,128 across a full year. A household on the local median income would put about 23.8% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is within the standard affordability guideline. The home-price-to-income ratio works out to 4.6×, against roughly 3.9× nationally, so buying is harder here than in the average US market. 84% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. Gross rent folds in the utilities a tenant pays separately, so it is closer to the real monthly outlay than a headline rent figure.

Every value on this page is published directly by the Census for this area — nothing is modelled or interpolated. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.