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![SENECA POST OFFICE](/images/post-offices/or/Seneca-or-post-office.png)
112 Barnes Ave
Seneca, OR 97873
Seneca, OR 97873
The Seneca Post Office is located in the state of Oregon within Grant County. This location serves 228 Seneca residents with a median income of $28,500. It's estimated that approximately 364 packages pass through this post office each year.