Last names starting with "O"
- Class of 2013 Scott O Connor
- Class of 1986 Jennifer O'Connor
- Thomas O'toole
- Class of 1965 Barak Obama
- Class of 1985 Francis Obrien
- Sean Obrien
- Class of 1966 Lois OConnor
- Class of 1973 Maureen Odonnell
- Scott Odonnell
- Class of 1961 Cheryl Olefield
- Class of 1979 Lisa Oliver
- Class of 2012 Miss Oliveria
- Class of 1982 Mike ORourke
- Class of 1987 Jeff Ostrum
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About the Hanover High School Alumni Directory
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