Founded in 1854, Multnomah County is one of 36 counties in the state of Oregon. Historically, Multnomah County was formed from Eastern part of Washington and the northern part of Clackamas counties. The city of Portland is the county seat. With FIPS code of 51, Multnomah County has a population of 803,377 and area of 435 square miles (1,127 km2).
List of all cities in Multnomah County, OR alphabetically
| City/Town | Postal Code | Area Code |
| Bridal Veil, OR | 97010 | 503/971 |
| Burlington, OR | 97231 | 503/971 |
| Corbett, OR | 97019 | 503/971 |
| Damascus, OR | 97030 | 503/971 |
| 97080 | 503/971 | |
| Fairview, OR | 97024 | 503/971 |
| Gresham, OR | 97030 | 503/971 |
| 97080 | 503/971 | |
| Interlachen, OR | 97024 | 503/971 |
| Maywood Park, OR | 97220 | 503/971 |
| Pacific Power, OR | 97256 | 503/971 |
| Pacificorp, OR | 97256 | 503/971 |
| Parkrose, OR | 97220 | 503/971 |
| 97230 | 503/971 | |
| Portland, OR | 97201 | 503/971 |
| 97202 | 503/971 | |
| 97203 | 503/971 | |
| 97204 | 503/971 | |
| 97205 | 503/971 | |
| 97206 | 503/971 | |
| 97207 | 503/971 | |
| 97208 | 503/971 | |
| 97209 | 503/971 | |
| 97210 | 503/971 | |
| 97211 | 503/971 | |
| 97212 | 503/971 | |
| 97213 | 503/971 | |
| 97214 | 503/971 | |
| 97215 | 503/971 | |
| 97216 | 503/971 | |
| 97217 | 503/971 | |
| 97218 | 503/971 | |
| 97219 | 503/971 | |
| 97220 | 503/971 | |
| 97221 | 503/971 | |
| 97227 | 503/971 | |
| 97228 | 503/971 | |
| 97230 | 503/971 | |
| 97231 | 503/971 | |
| 97232 | 503/971 | |
| 97233 | 503/971 | |
| 97236 | 503/971 | |
| 97238 | 503/971 | |
| 97239 | 503/971 | |
| 97240 | 503/971 | |
| 97242 | 503/971 | |
| 97256 | 503/971 | |
| 97258 | 503/971 | |
| 97266 | 503/971 | |
| 97280 | 503/971 | |
| 97282 | 503/971 | |
| 97283 | 503/971 | |
| 97286 | 503/971 | |
| 97290 | 503/971 | |
| 97292 | 503/971 | |
| 97293 | 503/971 | |
| 97294 | 503/971 | |
| 97296 | 503/971 | |
| 97299 | 503/971 | |
| Rockwood, OR | 97233 | 503/971 |
| Springdale, OR | 97060 | 503/971 |
| Troutdale, OR | 97060 | 503/971 |
| Wood Village, OR | 97024 | 503/971 |
| 97060 | 503/971 |