Kelso city, Washington
Official LSAD Designation: Kelso city • Census GEOID: 5335065
• Cowlitz County
Demographics & Population Profile
Population and demographics for Kelso city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 12,801 | — | 2025 | Census |
| Median Age | 39.9 yrs | ±3.7 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 5,435 | ±272 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).