Mercer County Post Offices


Sponsored Listings:

702 Main St
Cainsville, Missouri 64632

101 N State St
Mercer, Missouri 64661

204 S Broadway St
Princeton, Missouri 64673

Mercer County

There are 3 US Post Offices in Mercer County serving a total of 4,037 residents equating to 1,346 residents per post office. It's estimated that approximately 6,444 packages are handled across the 3 county post offices annually. Mercer County is a county located in the northwestern portion of the U.S. state of Missouri. As of the 2010 census, the population was 3,785, making it the second-least populous county in Missouri. Its county seat is Princeton. The county was organized February 14, 1845 and named for General John F. Mercer of the Revolutionary War."


Post Offices by ZIP Code

  • 64661 - Mercer MO
  • 64632 - Cainsville MO
  • 64673 - Princeton MO