Last names starting with "O"
- Class of 1969 Marie O'leary
- Tina O'Neil
- Class of 1981 Danielle O'Neill
- Class of 2005 Stephanie O'niell
- Class of 2013 Mackenzie Oeder
- Class of 1975 Mary Jo Olbrich
- Linda Olinger
- Class of 2009 SaVANAH Olroyd
- Class of 2001 Jamie Olson
- Class of 1968 Maryellen Olson
- Class of 1972 Mike Olson
- Class of 1976 Paul Olson
- Class of 1977 Tina Oneill
- Class of 2015 Christian Orozco
- Class of 1999 Timothy Osorio
- Class of 2010 Dylan Ottesen
- Class of 1975 Janet Otto
- Class of 1980 Gregory Overcash
- Class of 1990 Jason Owen
- Class of 1999 John Owens
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