Founded in 1843, Marion County is one of 36 counties in the state of Oregon. Historically, Marion County was one of the original four districts of the Oregon territory. The city of Salem is the county seat. With FIPS code of 47, Marion County has a population of 347,119 and area of 1,185 square miles (3,069 km2).
List of all cities in Marion County, OR alphabetically
| City/Town | Postal Code | Area Code |
| Aumsville, OR | 97325 | 503/971 |
| Aurora, OR | 97002 | 503/971 |
| Brooks, OR | 97305 | 503/971 |
| Butteville, OR | 97002 | 503/971 |
| Dept Employment, OR | 97311 | 503/971 |
| Dept Motor Vehicle, OR | 97314 | 503/971 |
| Detroit, OR | 97342 | 503/971 |
| Donald, OR | 97020 | 503/971 |
| Gates, OR | 97346 | 503/971 |
| Gervais, OR | 97026 | 503/971 |
| Hubbard, OR | 97032 | 503/971 |
| Idanha, OR | 97350 | 503/971 |
| Jefferson, OR | 97352 | 541 |
| Keizer, OR | 97303 | 503/971 |
| 97307 | 503/971 | |
| Marion, OR | 97392 | 503/971 |
| Mehama, OR | 97384 | 503/971 |
| Monitor, OR | 97071 | 503/971 |
| Mount Angel, OR | 97362 | 503/971 |
| Saint Benedict, OR | 97373 | 503/971 |
| Saint Louis, OR | 97026 | 503/971 |
| Saint Paul, OR | 97137 | 503/971 |
| Salem, OR | 97301 | 503/971 |
| 97302 | 503/971 | |
| 97303 | 503/971 | |
| 97305 | 503/971 | |
| 97306 | 503/971 | |
| 97307 | 503/971 | |
| 97308 | 503/971 | |
| 97309 | 503/971 | |
| 97310 | 503/971 | |
| 97311 | 503/971 | |
| 97312 | 503/971 | |
| 97314 | 503/971 | |
| 97317 | 503 | |
| Scotts Mills, OR | 97375 | 503/971 |
| Silverton, OR | 97381 | 503/971 |
| State Accident Ins, OR | 97312 | 503/971 |
| State Government, OR | 97310 | 503/971 |
| Stayton, OR | 97383 | 503/971 |
| Sublimity, OR | 97385 | 503/971 |
| Turner, OR | 97392 | 503/971 |
| West Stayton, OR | 97325 | 503/971 |
| Woodburn, OR | 97071 | 503/971 |