People with the last name Cowperthwait in Pennsylvania
- Beatrice Cowperthwait
- Becki Cowperthwait
- Carole Cowperthwait
- Catherine Cowperthwait
- Craig Cowperthwait
- Daphne Cowperthwait
- Derrick Cowperthwait
- Eleanor Cowperthwait
- Gary Cowperthwait
- George Cowperthwait
- J William Cowperthwait
- James Cowperthwait
- Ken Cowperthwait
- Kenneth Cowperthwait
- L Murray Cowperthwait
- Marion Cowperthwait
- Michelle Cowperthwait
- Murray Cowperthwait
- Nicole Cowperthwait
- Ronald Cowperthwait
- Stephen Cowperthwait
- Susan Cowperthwait
- Terri Cowperthwait
- William Cowperthwait
- Yvonne Cowperthwait
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