| Old Athletic Field, Old Athletic Field |
| Oltman Middle School, Oltman Middle School |
| Orono High School, Orono JV Field |
| Orono High School, Varsity Baseball Field |
| Orono - Northside Park, Northside Park |
| Osceola, Field # 6 |
| Osceola, Field # 9 |
| Osceola, Gator Site |
| Osceola JV Baseball Field, Osceola JV Baseball Field |
| Osseo High School, Osseo Memorial Field |
| Otto Berg, Otto Berg Field |
| Owasso Ball Fields, East |
| Owatonna High School, Field #1 |
| Owatonna High School, Field #2 |
| Owatonna - Jaycee Park, Jaycee Park |
| Owatonna Jaycee Park, Raymond Truelson Field |
| Owatonna Middle School, Middle School East |
| Owatonna Middle School, Middle School West |
| Owatonna Middle School, Owatonna Middle School East |
| Owatonna Middle School, Owatonna Middle School West |
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