Kelso city, Washington
Official LSAD Designation: Kelso city • Census GEOID: 5335065
• Cowlitz County
Kelso city is an incorporated city in Cowlitz County, Washington. According to official records from the Census (2025), Kelso city had an estimated population of 12,801 residents. Official Census Bureau geographic records classify this community under LSAD designation Kelso city (GEOID 5335065).
Local Government Administration U.S. Census Bureau GMAF
City Of Kelso
Municipal
Official Title:
Mayor
Address:
PO BOX 819, KELSO WA 98626-0078
County Of Cowlitz
County
Official Title:
Board Of Cowlitz County Commissioner
Address:
207 N 4TH AVE, RM 305, KELSO WA 98626-4191
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 12,801 | 2025 |
| Median Household Income | $66,751 | 2020-2024 |
| Median Home Value | $337,600 | 2020-2024 |
| Land Area | 8.15 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).