Oregon Counties Directory & Interactive Map
Complete official guide to all 36 counties in Oregon (OR). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Oregon County Breakdown
Showing 7 of 7 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Multnomah County (Portland) | 41051 | Portland | 815,428 | 431 sq mi | Lookup |
| Washington County | 41067 | Hillsboro | 600,372 | 724 sq mi | Lookup |
| Clackamas County | 41005 | Oregon City | 421,401 | 1,870 sq mi | Lookup |
| Lane County (Eugene) | 41039 | Eugene | 382,971 | 4,554 sq mi | Lookup |
| Marion County (Salem) | 41047 | Salem | 345,920 | 1,184 sq mi | Lookup |
| Jackson County (Medford) | 41029 | Medford | 223,259 | 2,785 sq mi | Lookup |
| Deschutes County (Bend) | 41017 | Bend | 198,253 | 3,018 sq mi | Lookup |
Geographic Structure of Oregon Counties
County Administration & Governance
In Oregon, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Portland and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Oregon counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (41) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Multnomah County (Portland) (815,428 residents)
- Largest by Land Area:Lane County (Eugene) (4,554 sq mi)
- State Capital:Salem
- Census Bureau Region:West United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.