Seneca is located in Grant County. About 165 people live here (as of 2020). Between 2010 and 2020, the population declined from 199 to 165. The region is at 1430 meters above sea level. The area covers about 2.1 square kilometers. There are about 24 streets in Seneca. The region was founded in 1970. The postal codes are 97873. The dialing code is 541. Seneca is city in Oregon, USA.
| Year built | 1970 |
| Area | 2.1 km² |
| Elevation | 1430 m |
| Located in | Grant County |
| Postal code | 97873 |
| Country | United States |
| Population | 165 |
| Official name | Seneca |
| Bike path |
| Bike lane on roadway |
| Cycling allowed on bus lane |
| Bicycle street |
| Open to cyclists |
| Open to cyclists, good path |
| Cycling prohibited |
| Cobblestone |
| Long-distance bike route | (depending on scale) |
| Long-distance bike route |
| Long-distance hiking trail | (depending on scale) |
| Long-distance hiking trail |
| Pedestrians prohibited |
Public transit map Seneca Legend 
Bicycle map Seneca Legend 
Pedestrian map Seneca Legend