Oregon counties by area
Official, comparable measurements for 36 counties and county equivalents.
- 431–823.6 mi²
- 828.2–1,628.4 mi²
- 1,638.6–2,289.5 mi²
- 2,381.1–3,215.5 mi²
- 4,527.8–10,134.5 mi²
- 0.73–3.3 per mi²
- 5.4–14 per mi²
- 14–49 per mi²
- 52–84 per mi²
- 122–1,845 per mi²
Understanding Oregon’s county areas
The land-area range runs from Multnomah County at 431 mi² to Harney County at 10,134.5 mi². The largest has 23.5 times the land area of the smallest and accounts for 10.6% of the combined county land in Oregon. Compare with every state’s largest county.
The median county-equivalent land area is 1,826.2 mi², above the national median of 604.5 mi². The median describes the middle of the county size distribution; it does not describe how people or development are distributed. A state with a few very large counties can have a much smaller median than its largest entry suggests.
Where water changes the picture
Curry County has the most assigned water area, at 360.8 mi². Clatsop County has the highest water share, with water making up 23.6% of its total area. Water area and water percentage answer different questions: the first measures an amount, while the second measures the mix of land and water.
Across all 36 entries, water accounts for 2.4% of the combined total area. This is calculated from the summed land and water measurements, rather than averaging county percentages, which would give each small and large county equal weight.
Where people live
An estimated 4,273,586 people lived in Oregon on July 1, 2025 (+0.9% since 2020), or 1.2% of the national total in this dataset. Multnomah County is the most populous county equivalent, with 795,391 residents — 18.6% of the state. The largest by land, Harney County, has 7,380.
Across the state there are 45 people per square mile of land. County densities range from 1,845 in Multnomah County to 0.73 in Harney County; the median county equivalent has 25. Switch the map above to density to see where the state’s population concentrates.
Compare the largest and smallest county equivalents in Oregon to see land, water, and total area on the same scale.
These calculations use the 2026 Census county records listed below. County-equivalent boundaries vary between states; area alone does not measure population, density, or usable land. See coverage and calculation rules.
Complete area table
Sorted from largest to smallest land area.
| # | County / equivalent | Land | Water | Water share | Population | Per mi² |
|---|---|---|---|---|---|---|
| 1 | Harney CountyGEOID 41025 | 10,134.5 mi² | 93.2 mi² | 0.9% | 7,380 | 0.73 |
| 2 | Malheur CountyGEOID 41045 | 9,887.7 mi² | 42.1 mi² | 0.4% | 32,261 | 3.3 |
| 3 | Lake CountyGEOID 41037 | 8,138.6 mi² | 219.5 mi² | 2.6% | 8,187 | 1 |
| 4 | Klamath CountyGEOID 41035 | 5,949.9 mi² | 187.3 mi² | 3.1% | 70,274 | 12 |
| 5 | Douglas CountyGEOID 41019 | 5,035.8 mi² | 97.2 mi² | 1.9% | 111,951 | 22 |
| 6 | Lane CountyGEOID 41039 | 4,554.1 mi² | 168.4 mi² | 3.6% | 381,584 | 84 |
| 7 | Grant CountyGEOID 41023 | 4,527.8 mi² | 0.7 mi² | 0% | 7,075 | 1.6 |
| 8 | Umatilla CountyGEOID 41059 | 3,215.5 mi² | 16.1 mi² | 0.5% | 81,119 | 25 |
| 9 | Wallowa CountyGEOID 41063 | 3,145.9 mi² | 5.5 mi² | 0.2% | 7,595 | 2.4 |
| 10 | Baker CountyGEOID 41001 | 3,068 mi² | 20 mi² | 0.6% | 16,658 | 5.4 |
| 11 | Deschutes CountyGEOID 41017 | 3,017.6 mi² | 36.6 mi² | 1.2% | 213,072 | 71 |
| 12 | Crook CountyGEOID 41013 | 2,978.9 mi² | 8.1 mi² | 0.3% | 27,564 | 9.3 |
| 13 | Jackson CountyGEOID 41029 | 2,783.3 mi² | 18.1 mi² | 0.6% | 221,795 | 80 |
| 14 | Wasco CountyGEOID 41065 | 2,381.1 mi² | 13.8 mi² | 0.6% | 26,310 | 11 |
| 15 | Linn CountyGEOID 41043 | 2,289.5 mi² | 19.4 mi² | 0.8% | 132,843 | 58 |
| 16 | Union CountyGEOID 41061 | 2,036.9 mi² | 1.9 mi² | 0.1% | 25,900 | 13 |
| 17 | Morrow CountyGEOID 41049 | 2,030.5 mi² | 17.1 mi² | 0.8% | 12,602 | 6.2 |
| 18 | Clackamas CountyGEOID 41005 | 1,870.7 mi² | 12.3 mi² | 0.7% | 426,280 | 228 |
| 19 | Jefferson CountyGEOID 41031 | 1,781.7 mi² | 10.1 mi² | 0.6% | 25,740 | 14 |
| 20 | Wheeler CountyGEOID 41069 | 1,716 mi² | 0.5 mi² | 0% | 1,472 | 0.86 |
| 21 | Josephine CountyGEOID 41033 | 1,638.6 mi² | 2.2 mi² | 0.1% | 87,867 | 54 |
| 22 | Curry CountyGEOID 41015 | 1,628.4 mi² | 360.8 mi² | 18.1% | 22,621 | 14 |
| 23 | Coos CountyGEOID 41011 | 1,596.1 mi² | 210.3 mi² | 11.6% | 63,992 | 40 |
| 24 | Gilliam CountyGEOID 41021 | 1,204.7 mi² | 18.1 mi² | 1.5% | 1,971 | 1.6 |
| 25 | Marion CountyGEOID 41047 | 1,180.8 mi² | 10.2 mi² | 0.9% | 355,777 | 301 |
| 26 | Tillamook CountyGEOID 41057 | 1,103.2 mi² | 229.2 mi² | 17.2% | 27,384 | 25 |
| 27 | Lincoln CountyGEOID 41041 | 981 mi² | 213.6 mi² | 17.9% | 50,636 | 52 |
| 28 | Clatsop CountyGEOID 41007 | 828.2 mi² | 255.4 mi² | 23.6% | 40,926 | 49 |
| 29 | Sherman CountyGEOID 41055 | 823.6 mi² | 7.6 mi² | 0.9% | 2,051 | 2.5 |
| 30 | Polk CountyGEOID 41053 | 740.9 mi² | 3.2 mi² | 0.4% | 90,037 | 122 |
| 31 | Washington CountyGEOID 41067 | 724.3 mi² | 2.4 mi² | 0.3% | 611,708 | 845 |
| 32 | Yamhill CountyGEOID 41071 | 715.9 mi² | 2.5 mi² | 0.3% | 110,024 | 154 |
| 33 | Benton CountyGEOID 41003 | 675.2 mi² | 3 mi² | 0.4% | 97,728 | 145 |
| 34 | Columbia CountyGEOID 41009 | 658.7 mi² | 30.3 mi² | 4.4% | 54,091 | 82 |
| 35 | Hood River CountyGEOID 41027 | 522.2 mi² | 11.2 mi² | 2.1% | 23,720 | 45 |
| 36 | Multnomah CountyGEOID 41051 | 431 mi² | 34 mi² | 7.3% | 795,391 | 1,845 |