Clackamas County vs Washington County
Two neighbouring counties in Oregon, compared on population, size, income and housing. They share 16 mi of border.
Clackamas County
Oregon
Washington County
Oregon
Both outlines are drawn at true relative size. Clackamas County spans about 91.8 km at its widest.
Side by side
| Measure | Clackamas County | Difference | Washington County |
|---|---|---|---|
| Population | 426,280 | -30.3% | 611,708 |
| Change since 2020 | 0.9% | -0.9 pp | 1.8% |
| Land area | 1,871 sq mi | +158.3% | 724.3 sq mi |
| Population density | 228 per sq mi | -73.0% | 845 per sq mi |
| Median household income | $103,517 | -3.9% | $107,772 |
| Median home value | $611,000 | +3.9% | $588,000 |
| Median age | 42.3 | +11.0% | 38.1 |
| Households | 163,845 | -30.4% | 235,406 |
| Housing units | 174,323 | -28.3% | 243,278 |
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026; US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. The difference column is computed here: the first county's figure against the second, expressed as a percentage of the second. The change-since-2020 row is the exception: two growth rates differ in percentage points (pp), not percent. Retrieved 30 August 2026.
What the numbers say
- Washington County holds about 1.4 times the population of Clackamas County: 611,708 against 426,280.
- Clackamas County covers more ground, at 1,871 square miles against 724.3.
- Washington County is the more crowded of the two, at 845 people per square mile against 228.
- Median household income is higher in Washington County, by 4,255 dollars a year.
- Since 2020, Clackamas County has grown by 0.9% and Washington County has grown by 1.8%.
- They share 16 mi of common border, which the Census Bureau publishes in its county adjacency file and which almost no other county reference presents.
Full pages
Want a different pair? Compare any two of the 3,144 US counties.
Rebuilt from source data 30 August 2026. How these figures are produced.