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Jeff Hahn (Postmaster)
jeffrey.b.hahn@usps.gov
731 State Route 57
Stewartsville, NJ 08886
Stewartsville, NJ 08886
The Stewartsville Post Office is located in the state of New Jersey within Warren County. This location serves 7,077 Stewartsville residents with a median income of $105,329. It's estimated that approximately 11,296 packages pass through this post office each year.