City · Washington
Castle Rock, Washington
Castle Rock, city, in Cowlitz County, Washington. Castle Rock had 2,442 residents on July 1, 2025 by the Census Bureau's estimate, down 0.2% since 2020; the 2020 Census counted 2,446 and the ACS 2020-2024 5-year estimates put it at 2,217 (±406). GEOID 5310565.
Residents, July 2025 estimate
2,442
Census Bureau estimate (no margin published)
2020 Census count: 2,446 · ACS 2020-2024: 2,217 ±406
Median household income
$69,639
±$11,397 (90% margin)
Washington: $98,141
Median home value
$348,600
±$29,233 (90% margin)
Washington: $564,600
Median gross rent
$1,222
±$214 (90% margin)
Washington: $1,760
Where is Castle Rock and what county is it in?
Castle Rock is a city in Cowlitz County, Washington. It covers 2.1 square miles of land, 1,168 residents per square mile in 2020.
Castle Rock is in the Longview-Kelso, WA metropolitan statistical area (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Castle Rock, and is it growing?
The Census Bureau estimates that 2,442 people lived in Castle Rock on July 1, 2025, down 0.2% since 2020, while Washington grew 3.8%. The 2020 Census counted 2,446 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 2,217 (±406).
| Measure | Castle Rock | Cowlitz County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 2,217 ±406 | 112,360 | −936 |
| Households | 871 ±153 | 43,943 | −292 |
| Average household size | 2.55 ±0.32 | 2.53 | no clear change |
| Housing units | 907 ±156 | 46,422 | −297 |
Castle Rock's population since 2000
From 2,130 in 2000 to 2,442 in 2025: up 14.6%. The 2000, 2010 and 2020 figures are census counts, each for Castle Rock as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Castle Rock?
The median resident of Castle Rock is 33.9 years old; 25.1% are under 18 and 19.4% are 65 or older. The largest group is non-Hispanic white residents at 89.3%, then Hispanic or Latino residents (of any race) at 2.8%.
| Measure | Castle Rock | Cowlitz County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 33.9 ±10.5 | 41.5 | no clear change |
| Under 18 years | 25.1% ±6.3 pts | 22.5% | – |
| 65 years and over | 19.4% ±7.3 pts | 19.8% | – |
| Male | 43.8% ±4.2 pts | 49.9% | – |
| Hispanic or Latino (any race) | 2.8% ±2.7 pts | 10.5% | – |
| White alone, not Hispanic | 89.3% ±6.4 pts | 79.6% | no clear change |
| Black or African American alone, not Hispanic | 0.4% ±0.8 pts | 0.6% | – |
| Asian alone, not Hispanic | 1.4% ±1.5 pts | 1.2% | – |
| American Indian and Alaska Native alone, not Hispanic | 1.1% ±1.1 pts | 0.8% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 2.6% ±4.0 pts | 0.4% | – |
| Two or more races, not Hispanic | 2.4% ±2.3 pts | 6.3% | – |
| Some other race alone, not Hispanic | 0.0% ±1.8 pts | 0.6% | – |
| Born outside the United States | 3.0% ±2.7 pts | 4.3% | – |
| Speak a language other than English at home (age 5+) | 3.1% ±2.7 pts | 7.9% | – |
| Civilian veterans (age 18+) | 10.7% ±4.7 pts | 10.3% | – |
| With a disability | 19.7% ±4.8 pts | 20.2% | – |
| No health insurance coverage | 5.8% ±3.7 pts | 6.2% | no clear change |
| High school graduate or higher (age 25+) | 88.2% ±4.8 pts | 89.9% | – |
| Bachelor's degree or higher (age 25+) | 15.8% ±6.2 pts | 17.6% | no clear change |
| Graduate or professional degree (age 25+) | 4.9% ±3.0 pts | 5.7% | – |
| Lived in the same house a year earlier | 84.8% ±8.2 pts | 88.2% | – |
| Moved from another state in the past year | 2.6% ±3.0 pts | 2.3% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Castle Rock earn?
Half of Castle Rock's 871 households earn less than $69,639 a year (±$11,397), against $76,531 in Cowlitz County and $98,141 in Washington. In 2015-2019 it was $62,240 in 2024 dollars; the margins of error cannot tell the two periods apart. 7.0% of residents live below the poverty line.
| Measure | Castle Rock | Cowlitz County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $69,639 ±$11,397 | $76,531 | no clear change |
| Mean household income | $79,888 ±$11,328 | $95,669 | – |
| Per capita income | $31,840 ±$5,939 | $38,105 | no clear change |
| People below the poverty line | 7.0% ±4.4 pts | 12.2% | no clear change |
| Children under 18 below the poverty line | 3.2% ±3.9 pts | 15.2% | – |
| Households receiving SNAP | 19.6% ±7.4 pts | 17.7% | – |
| Households with a computer | 96.9% ±3.4 pts | 95.5% | – |
| Households with a broadband subscription | 87.7% ±6.8 pts | 91.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Castle Rock?
Owners occupy 66.7% of Castle Rock's occupied homes and renters 33.3%. The median owner-occupied home is valued at $348,600 by its owner (±$29,233). The median renter pays $1,222 a month including utilities.
| Measure | Castle Rock | Cowlitz County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $348,600 ±$29,233 | $397,500 | +$145,043 |
| Median gross rent | $1,222 ±$214 | $1,206 | +$244 |
| Renters paying 35% or more of income on rent | 20.2% ±13.7 pts | 41.1% | – |
| Median monthly owner costs, with a mortgage | $1,648 ±$247 | $1,949 | – |
| Owner-occupied homes | 66.7% ±10.5 pts | 68.0% | no clear change |
| Renter-occupied homes | 33.3% ±10.5 pts | 32.0% | – |
| Housing units | 907 ±156 | 46,422 | −297 |
| Homeowner vacancy rate | 0.0% ±6.4 pts | 0.4% | – |
| Rental vacancy rate | 0.0% ±12.9 pts | 3.4% | – |
| Single-family detached homes | 77.1% ±7.8 pts | 69.4% | – |
| Mobile homes | 5.2% ±3.7 pts | 8.5% | – |
| Built 2020 or later | 0.0% ±4.3 pts | 1.4% | – |
| Built 2010 to 2019 | 7.6% ±3.8 pts | 7.6% | – |
| Built 1939 or earlier | 22.8% ±9.5 pts | 13.7% | – |
| Households with no vehicle | 3.3% ±2.5 pts | 6.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Castle Rock building?
Builders took permits for 1 new housing units in Castle Rock in 2025 (1 in single-family houses), 0.4 per 1,000 residents against 4.4 across Washington.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Castle Rock work and get to work?
74.5% of Castle Rock's workers drive alone and 7.3% work from home. The average trip to work takes 28.2 minutes.
| Measure | Castle Rock | Cowlitz County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 55.0% ±8.2 pts | 56.7% | – |
| Unemployment rate | 7.6% ±6.0 pts | 5.9% | – |
| Drove alone to work | 74.5% ±9.5 pts | 81.5% | – |
| Carpooled | 17.7% ±8.7 pts | 8.1% | – |
| Public transportation | 0.0% ±4.7 pts | 0.4% | – |
| Walked | 0.5% ±0.9 pts | 0.9% | – |
| Worked from home | 7.3% ±4.4 pts | 8.2% | – |
| Mean travel time to work | 28.2 min ±6.1 | 26.1 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Castle Rock?
1 census tract lies mostly in Castle Rock, and 1 more reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 20.03Cowlitz County | 4,728 | $82,159 |
| Tract 20.01Cowlitz County | 3,681 | $86,250 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Castle Rock) · Census block assignment files
How does Castle Rock compare with other places in Washington?
By the Census Bureau's July 2025 estimates, Castle Rock is the 6,987th-most populous of the 19,476 U.S. incorporated places that have one and the 159th-most populous of 281 in Washington.
Castle Rock ranks 311th of 387 places in Washington with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 159th | 281 |
| Growth 2020-2025 (PEP) | 163rd | 203 |
| Residents per square mile | 232nd | 394 |
| Median household income | 311th | 387 |
| Per capita income | 333rd | 393 |
| Median home value | 316th | 384 |
| Median gross rent | 256th | 351 |
| Poverty rate | 196th | 281 |
| Bachelor's degree or higher | 344th | 382 |
| Median age | 335th | 394 |
| Owner-occupied share | 243rd | 388 |
| Work from home | 282nd | 307 |
| Travel time to work | 169th | 394 |
Castle Rock's figures with every place in Washington (CSV)
Every place in Washington, sortable · Compare Castle Rock with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Castle Rock?
20 of the 57 figures for Castle Rock on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Castle Rock are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Castle Rock.