Founded in 1887, Malheur County is one of 36 counties in the state of Oregon. Historically, Malheur County was formed from Southern portion of Baker County. The city of Vale is the county seat. With FIPS code of 45, Malheur County has a population of 31,693 and area of 9,888 square miles (25,610 km2).
List of all cities in Malheur County, OR alphabetically
| City/Town | Postal Code | Area Code |
| Adrian, OR | 97901 | 541 |
| Arcadia, OR | 97913 | 541 |
| Arock, OR | 97902 | 541 |
| Beulah, OR | 97911 | 541 |
| Brogan, OR | 97903 | 541 |
| Burns Junction, OR | 97910 | 541 |
| Cairo, OR | 97914 | 541 |
| Claude, OR | 97914 | 541 |
| Danner, OR | 97910 | 541 |
| Harper, OR | 97906 | 541 |
| Ironside, OR | 97908 | 541 |
| Jamieson, OR | 97909 | 541 |
| Jonesboro, OR | 97911 | 541 |
| Jordan Valley, OR | 97910 | 541 |
| Juntura, OR | 97911 | 541 |
| Nyssa, OR | 97913 | 541 |
| Ontario, OR | 97914 | 541 |
| Owyhee Corners, OR | 97913 | 541 |
| Riverside, OR | 97917 | 541 |
| Rome, OR | 97910 | 541 |
| Vale, OR | 97908 | 541 |
| 97918 | 541 | |
| Westfall, OR | 97920 | 541 |
| Willowcreek, OR | 97918 | 541 |