Hardin County Post Offices


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153 E Main St
Cave in Rock, Illinois 62919

202 Main St
Elizabethtown, Illinois 62931

1 Postal Way
Rosiclare, Illinois 62982

Hardin County

There are 3 US Post Offices in Hardin County serving a total of 3,902 residents equating to 1,301 residents per post office. It's estimated that approximately 6,228 packages are handled across the 3 county post offices annually. Hardin County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 4,320, making it the least populous county in Illinois. Its county seat is Elizabethtown. Hardin County is located in the part of the state known as Little Egypt."


Post Offices by ZIP Code

  • 62931 - Elizabethtown IL
  • 62982 - Rosiclare IL
  • 62919 - Cave In Rock IL