Founded in 1844, Clatsop County is one of 36 counties in the state of Oregon. Historically, Clatsop County was formed from Northern and western portions of the original Twality District. The city of Astoria is the county seat. With FIPS code of 7, Clatsop County has a population of 41,810 and area of 827 square miles (2,142 km2).
List of all cities in Clatsop County, OR alphabetically
| City/Town | Postal Code | Area Code |
| Arch Cape, OR | 97102 | 503/971 |
| Astoria, OR | 97103 | 503/971 |
| Cannon Beach, OR | 97110 | 503/971 |
| Elsie, OR | 97138 | 503/971 |
| Gearhart, OR | 97138 | 503/971 |
| Hammond, OR | 97121 | 503/971 |
| Jewell, OR | 97138 | 503/971 |
| Seaside, OR | 97138 | 503/971 |
| Tolovana Park, OR | 97145 | 503/971 |
| Tongue Point, OR | 97103 | 503/971 |
| Warrenton, OR | 97146 | 503/971 |