The Belknap Post Office is located in the state of Illinois within Massac County. This location serves 467 Belknap residents with a median income of $26,528. It's estimated that approximately 745 packages pass through this post office each year.
The Belknap Post Office is located in the state of Illinois within Massac County. This location serves 467 Belknap residents with a median income of $26,528. It's estimated that approximately 745 packages pass through this post office each year.