Ironsides is an unincorporated community or "post village" in Charles County, Maryland, United States with zip code 20643. The Post Office was established in 1897 and remained open until at least 1976. Today Ironsides area residents have Indian Head or Nanjemoy addresses. The nearby historic post offices of Nanjemoy and Doncaster, dating from …Ironsides is an unincorporated community or "post village" in Charles County, Maryland, United States with zip code 20643. The Post Office was established in 1897 and remained open until at least 1976. Today Ironsides area residents have Indian Head or Nanjemoy addresses. The nearby historic post offices of Nanjemoy and Doncaster, dating from 1800 and 1855, are often associated with historical records of Ironsides.
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