The child, who is under the age of 10, lives in west Riverside County and has been recovering at home, the Riverside University Health System-Public Health announced on Friday.
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Health officials were notified of the preliminary positive test results earlier this week and are working to determine the source of the infection, they said.
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The child did not need to be hospitalized.
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"This case reminds everyone that [monkeypox] can impact anyone, [regardless] of age, gender or sexual orientation," said the public health officer for Riverside County Dr. Geoffrey Leung.
In total, Riverside County has reported about 256 confirmed or probable cases of monkeypox, the majority coming from the Coachella Valley.
Officials said there have been a handful of cases reported in women.