Founded in 1843, Clackamas County is one of 36 counties in the state of Oregon. Historically, Clackamas County was one of the original four districts of the Oregon Country. The city of Oregon City is the county seat. With FIPS code of 5, Clackamas County has a population of 422,537 and area of 1,868 square miles (4,838 km2).
List of all cities in Clackamas County, OR alphabetically
| City/Town | Postal Code | Area Code |
| Barlow, OR | 97013 | 503/971 |
| Beavercreek, OR | 97004 | 503/971 |
| Boring, OR | 97009 | 503/971 |
| 97089 | 503 | |
| Brightwood, OR | 97011 | 503/971 |
| Canby, OR | 97013 | 503/971 |
| Carver, OR | 97015 | 503/971 |
| Charbonneau, OR | 97070 | 503/971 |
| Clackamas, OR | 97015 | 503/971 |
| 97086 | 503 | |
| 97089 | 503 | |
| Colton, OR | 97017 | 503/971 |
| Damascus, OR | 97009 | 503/971 |
| 97015 | 503/971 | |
| 97089 | 503 | |
| Dover, OR | 97022 | 503/971 |
| Eagle Creek, OR | 97022 | 503/971 |
| Estacada, OR | 97023 | 503/971 |
| Gladstone, OR | 97027 | 503/971 |
| Government Campound, OR | 97028 | 503/971 |
| Gresham, OR | 97089 | 503 |
| Happy Valley, OR | 97015 | 503/971 |
| 97086 | 503 | |
| 97089 | 503 | |
| Jennings Lodge, OR | 97267 | 503/971 |
| Johnson City, OR | 97267 | 503/971 |
| Lake Grove, OR | 97034 | 503/971 |
| 97035 | 503/971 | |
| Lake Oswego, OR | 97034 | 503/971 |
| 97035 | 503/971 | |
| Liberal, OR | 97038 | 503/971 |
| Marylhurst, OR | 97036 | 503/971 |
| Milwaukie, OR | 97222 | 503/971 |
| 97267 | 503/971 | |
| 97269 | 503/971 | |
| Molalla, OR | 97038 | 503/971 |
| Mountain Park, OR | 97035 | 503/971 |
| Mulino, OR | 97042 | 503/971 |
| Oak Grove, OR | 97222 | 503/971 |
| 97267 | 503/971 | |
| 97268 | 503/971 | |
| Oak Lodge, OR | 97267 | 503/971 |
| Oregon City, OR | 97045 | 503/971 |
| Oswego, OR | 97034 | 503/971 |
| Portland, OR | 97086 | 503 |
| 97222 | 503/971 | |
| 97267 | 503/971 | |
| 97268 | 503/971 | |
| 97269 | 503/971 | |
| Redland, OR | 97045 | 503/971 |
| Rhododendron, OR | 97049 | 503/971 |
| Sandy, OR | 97055 | 503/971 |
| Timberline Lodge, OR | 97028 | 503/971 |
| Timbrline Lodge, OR | 97028 | 503/971 |
| Wankers Corners, OR | 97068 | 503/971 |
| Welches, OR | 97067 | 503/971 |
| Wemme, OR | 97067 | 503/971 |
| West Linn, OR | 97034 | 503/971 |
| 97068 | 503/971 | |
| Willamette, OR | 97068 | 503/971 |
| Wilsonville, OR | 97070 | 503/971 |
| Zigzag, OR | 97049 | 503/971 |