The Seneca Post Office is located in the state of Illinois within La Salle County. This location serves 3,393 Seneca residents with a median income of $58,906. It's estimated that approximately 5,416 packages pass through this post office each year.
The Seneca Post Office is located in the state of Illinois within La Salle County. This location serves 3,393 Seneca residents with a median income of $58,906. It's estimated that approximately 5,416 packages pass through this post office each year.