Saint (or St) Johnstown, Johnstoun, Johnston or Johnstone may refer to:
Ireland
- St Johnston, County Donegal
- Saint Johnstown or Ballinalee, County Longford
Scotland
- Perth, Scotland, originally known as Saint John's Toun or St Johnstone
- St Johnstone F.C., based in Perth
United States
- Saint Johnstown, Delaware, a stop on the now defunct Queen Anne's Railroad line between Ellendale and Greenwood
See also
- Johnston (disambiguation)
- Johnstown (disambiguation)
- Saint John (disambiguation)
- Saint John's (disambiguation)
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