All three cases were reported within 14 days, which health officials classify as an outbreak.
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School officials said they are doing everything they can to contain the spread.
RELATED: COVID-19 cases increasing in Mariposa County
Starting Monday, parents and students will be required to complete a symptom check every time they step foot on a Mariposa County campus.
School administrators reminded parents that if their child does not feel well, they should stay home, regardless of their vaccination status.
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Officials are also encouraging everyone to get vaccinated.
RELATED: CDC COVID risk map highlights areas of high transmission in Central California
For more information on vaccine or testing sites in the county, click here.