Last names starting with "O"
Unknown Grad Year
- Class of 1964 Kathryn OBrien O'Brien (now Johnson)
- Class of 1950 Barbara Oestreich (formerly Herried)
- Richard Ofsten
- Class of 1971 John Ofstun
- Class of 1968 Jim Okeefe
- Eric Olsen
- Class of 1984 Jackie Opperman (now Milligan)
- Class of 1990 Cara Otis
- Class of 1985 Carl Otis
- Class of 1964 Linda Otis (formerly Henry)
- Joe Ott
- Class of 1973 Sally Ott
- Class of 2004 Stacy Owen
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