City in Cowlitz County, Washington · 2.1 sq mi · 1,164 people per sq mi
2,439 people live in Castle Rock. The typical household earns $69,639, and the median resident is 33.9 years old.
2026 projection
From 2,446 in 2020
Poverty rate 7.04%
Men 40.6 · Women 32.2
2010–2026
2,439
2026 projection
0.3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
2010–2026
2,439
2026 projection
0.3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 2,439 | -3 | 0.12% |
|---|---|---|---|
| 2025 | 2,442 | +6 | 0.25% |
| 2024 | 2,436 | +1 | 0.04% |
| 2023 | 2,435 | +1 | 0.04% |
| 2022 | 2,434 | -12 | 0.49% |
| 2021 | 2,446 | 0 | 0.00% |
| 2020 | 2,446 | +18 | 0.74% |
| 2019 | 2,428 | +48 | 2.02% |
| 2018 | 2,380 | +47 | 2.01% |
| 2017 | 2,333 | +42 | 1.83% |
Showing 10 of 17 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Castle Rock has a population change lower than Cowlitz County, Washington, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 22 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 14 residents
45% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 45% | 51% | 41% |
| Never married | 24% | 24% | 23% |
| Divorced | 21% | 15% | 25% |
| Widowed | 10% | 9% | 11% |
| Separated | <1% | 2% | 0% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources