Last names starting with "O"
- Class of 1966 Dennis O'connor
- Class of 1966 Dennis Oconnor
- Class of 2000 Patrick OConnor
- Class of 1973 Mary Pearl OLsen
- Class of 1998 Jeremy Olson
- Class of 1977 Mary Beth Olson
- Class of 1994 Ursula Olson
- Class of 1984 Donna Opseth (now Adams)
- Class of 1995 Angie Otterbein
- Class of 1960 Sharon Otterbein
- Class of 1969 Wayne Otterbein
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