Founded in 1885, Morrow County is one of 36 counties in the state of Oregon. Historically, Morrow County was formed from Western portion of Umatilla County and a small portion of eastern Wasco County. The city of Heppner is the county seat. With FIPS code of 49, Morrow County has a population of 12,303 and area of 2,033 square miles (5,265 km2).
List of all cities in Morrow County, OR alphabetically
| City/Town | Postal Code | Area Code |
| Boardman, OR | 97818 | 541 |
| Heppner, OR | 97836 | 541 |
| Ione, OR | 97843 | 541 |
| Irrigon, OR | 97844 | 541 |
| Lexington, OR | 97839 | 541 |