Castle Rock, Washington Demographics & Population 2026
During the 2020–2024 ACS period, Castle Rock, Washington had a total population of 2,217, the 300th largest city in Washington, with a median household income of $69,639, which is 29% lower than the state average. The poverty rate is 7.0%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Castle Rock Quick Facts
How Castle Rock Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 2,298 | 2,217 | -3.5% |
| Median household income | $65,272 | $69,639 | +6.7% |
| Median home value | $301,000 | $348,600 | +15.8% |
How Castle Rock Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 56 | National average: 61
Education
Educational Attainment (Adults 25+)
Castle Rock Rankings in Washington
Explore Washington Rankings
Other Cities in Cowlitz County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Longview | 38,069 | $61,747 | 16.1% | $361,600 |
| Kelso | 12,684 | $66,751 | 12.0% | $337,600 |
| Lexington | 4,413 | $101,389 | 3.5% | $359,900 |
| Longview Heights | 4,357 | $74,570 | 11.2% | $456,700 |
| Kalama | 3,050 | $102,026 | 13.4% | $471,500 |
| Beacon Hill | 1,804 | $86,806 | 15.5% | $397,600 |
| Ryderwood | 401 | $42,639 | 11.7% | $229,900 |
| Cougar | 151 | N/A | 0.0% | N/A |
Cities Similar to Castle Rock
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Westport | 2,217 | $64,750 | $196,600 | 17.1% | 7.3% |
| Carson | 2,318 | $68,929 | $490,400 | 15.7% | 8.5% |
| Ocean Park | 2,122 | $65,676 | $350,500 | 24.8% | 10.2% |
| Cosmopolis | 2,202 | $84,853 | $317,000 | 26.6% | 10.3% |
| Winlock | 2,140 | $80,451 | $361,700 | 17.2% | 14.9% |
Population Overview
Castle Rock is a small community located in Washington, within Cowlitz County. The total population is 2,217. It ranks as the 300th most populous out of 628 Census-designated places in Washington.
Age Demographics
The median age in Castle Rock is 33.9 years. This is 11% lower than the state median of 38.3 years.
Economy, Income & Housing
The median household income in Castle Rock is $69,639. This is 29% lower than the state median of $98,141. It is also 14% lower than the national median of $80,734. The poverty rate stands at 7.0%. This is 29% lower than the state poverty rate of 9.9%. The unemployment rate is 7.6%. This is 49% higher than the state rate of 5.1%. The median home value is $348,600. Housing costs are 38% lower than the state median of $564,600. The home-value-to-income ratio is 5.0x. 66.7% of occupied housing units are owner-occupied. This homeownership rate is 5% higher than the state average of 63.8%.
Race & Ethnicity
Castle Rock has a predominantly White (non-Hispanic) population, comprising 89.3% of all residents. Hispanic or Latino residents account for 2.8%. The Black or African American population (0.4%) is well below the state average of 3.9%. The Hispanic or Latino population (2.8%) is well below the state average of 14.4%. The Asian population (1.4%) is well below the state average of 9.7%.
Education
15.8% of residents aged 25 and older hold a bachelor's degree or higher. This is 60% lower than the state rate of 39.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 88.2%.
Data Sources & Methodology
All demographic data for Castle Rock, Washington is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Washington state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 628 Census-designated places in Washington. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Castle Rock, Washington?
Castle Rock, Washington has a population of 2,217 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Castle Rock, WA?
The median household income in Castle Rock is $69,639, which is 14% lower than the national median of $80,734.
What is the poverty rate in Castle Rock, WA?
The poverty rate in Castle Rock is 7.0%. This means approximately 156 residents live below the federal poverty line.
What is the racial makeup of Castle Rock, Washington?
Castle Rock's population is 89.3% White, 0.4% Black, 2.8% Hispanic/Latino, and 1.4% Asian.
What is the median home value in Castle Rock, WA?
The median home value in Castle Rock is $348,600. The home-value-to-income ratio is 5.0x.
How educated is Castle Rock, Washington?
15.8% of adults (25+) in Castle Rock hold a bachelor's degree or higher, and 4.9% hold a graduate or professional degree.