Golden State Foods Corp. in Industry, S&S Foods in Azusa and a Mission Foods facility in Commerce are all now closed.
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County health officials say they each had more than 40 cases and failed to notify the county as required.
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The shutdowns come days after Los Angeles Apparel, the site of the county's worst COVID-19 outbreak, was allowed to reopen. The business' facility in South L.A. saw a COVID-19 outbreak that led to more than 300 workers contracting the virus, resulting in the death of four people.
LA Apparel factory allowed to reopen under safety measures following COVID-19 outbreak