In addition to the JCHS Museum, the society also manages and interprets three historic sites: Plum Grove Historic Home, the ...1855 Johnson County Poor Farm & Asylum, and the 1876 Coralville Schoolhouse. Plum Grove Historic Home Operating Hours Memorial Day - Labor Day: Wednesday-Sunday 1:00pm-5:00pm **Weekends only starting Labor Day through October 31st** The 1855 Johnson County Poor Farm...
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