Saint Johnstown

• St Johnston, County Donegal
• St Johnstown (County Donegal) (Parliament of Ireland constituency)
• Saint Johnstown or Ballinalee, County Longford
• St Johnstown (County Longford) (Parliament of Ireland constituency)

• Perth, Scotland, originally known as Saint John's Toun or St Johnstone
• St Johnstone F.C., based in Perth

• Saint Johnstown, Delaware, a stop on the now defunct Queen Anne's Railroad line between Ellendale and Greenwood

• Johnston (disambiguation)
• Johnstown (disambiguation)
• Saint John (disambiguation)
• Saint John's (disambiguation)

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