Garry D Rightnowar (Postmaster)
garry.d.rightnowar@usps.gov
1301 Broadway St
Mount Vernon, IL 62864
Mount Vernon, IL 62864
The Mount Vernon Carrier Annex Post Office is located in the state of Illinois within Jefferson County. This location serves 24,108 Mount Vernon residents with a median income of $39,078. It's estimated that approximately 38,479 packages pass through this post office each year.