Oregon Territory
1850 Counties
| County | Description | Area in sq miles | Courts held at | Pop in 1850 |
| Benton | on St Mary's river | blank | blank | 418 |
| Clackamas | no description | blank | blank | 1,162 |
| Clark | no description | blank | Columbia City | 643 |
| Clatsop | western boundary, water by Columbia river | blank | Astoria | blank |
| Elk | not listed | |||
| Lewis | not listed | |||
| Linn | no description | blank | blank | 994 |
| Marion | no description | blank | blank | 2,749 |
| Polk | no description | blank | Lackemute | 1,051 |
| Umpqua | not listed | |||
| Washington | no description | blank | blank | 9,970 |
| Yam Hill | no decription | blank | blank | 1,512 |
1850 Towns
| Name | What | County | Pop | Other |
| Astoria | PO | Clatsop | ||
| Buteville | PO | Marion | ||
| Calapooia | PO | Linn | ||
| Cascade | PO | Clark | ||
| Catalamet | PO | Lewis | ||
| Champoag | PO | Marion | ||
| Chehalem | PO | Yam Hill | ||
| Cincinnati | PO | Polk | ||
| Columbia City | PO, CH | Clarke | seat of justice, water by Columbia river | |
| Dallas | PO | not given | ||
| Dayton | PO | Yam Hill | ||
| Elkton | PO | Umpqua | ||
| Eminence | PO | Washington | ||
| Forks of Mary's River | PO | Benton | ||
| Fort Laramie | PO | Clackamas | ||
| Gardiner City | PO | not given | ||
| Harris' Ferry | PO | Washington | ||
| Hillsborough | PO | Washington | ||
| Lackemute | PO | Polk | ||
| Lafayette | PO | Yam Hill | ||
| Lexington | PO | Clatsop | ||
| Linn City | PO | Washington | ||
| Marysville | PO | Benton | ||
| Milwaukee | PO | Clackamas | ||
| Monticello | PO | Lewis | ||
| Mouth of Willamette | PO | Elk | ||
| Nesmith's | PO | Polk | ||
| New Albany | PO | Linn | ||
| North Yam Hill | PO | Yam Hill | ||
| Oak Point | PO | Louis | ||
| Olympia | PO | Louis | ||
| Oregon City | PV | Clackamas | 702 | |
| Pacific City | PO | Lewis | ||
| Pleasant Hill | PO | Benton | ||
| Portland | PO | Washington | ||
| Rickreal | PO | Polk | ||
| Rome | PO | Marion | ||
| St Helen | PO | Washington | ||
| Salem | PO | Marion | ||
| Santyam | PO | Linn | ||
| Santyam Forks | PO | Linn | ||
| Scottsburgh | PO | Benton | ||
| Skinners | PO | Benton | ||
| Slough | PO | Clackamas | ||
| Syracuse | PO | Marion | ||
| Tulatin Plains | PO | Washington | ||
| Twality Plains | PO | Washington | ||
| Umpqua City | PO | Umpqua | ||
| Willamette | PO | Yam Hill | ||
| Willamette Forks | PO | Linn | ||
| Winchester | PO | Umpqua | ||
| Yam Hill Farms | PO | Yam Hill | ||
| Yoncalla | PO | Benton |