Illinois Department of Public Health data show the state's previous lowest total was 462 cases on June 22 of last year.
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Still, public health officials reported 33 additional deaths the same day and have previously said that weekend case counts are generally lower.
The news comes as more than half of Illinois adults have been fully vaccinated.
State officials are encouraging more people to get vaccinated and are making the shots available to Memorial Day weekend travelers throughout the state, including a vaccine clinic at Union Station in Chicago.
There have been 1,382,186 total COVID cases, including 22,827 deaths in the state since the pandemic began.
Within the past 24 hours, laboratories have reported testing 25,692 specimens for a total of 24,616,087since the pandemic began.
The preliminary seven-day statewide test positivity from May 24 to May 30, is 2.0%.
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As of Sunday night, 1,093 patients in Illinois were reported to be in the hospital with COVID-19. Of those, 294 patients were in the ICU and 167 patients with COVID-19 were on ventilators.
A total of 11,291,906 vaccines have been administered in Illinois as of Sunday night. The seven-day rolling average of vaccines administered daily is 50,162 doses. There were 22,255 doses reported administered in Illinois Sunday.
Officials said 67% of Illinois adults have received at least one vaccine dose and over 50% are fully vaccinated.
Chicago holding beach pop-up vaccination clinics on Memorial Day
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The deaths reported Sunday include:
-Cook County: 1 male 30s, 1 female 50s, 3 males 50s, 2 females 60s, 7 males 60s, 2 females 70s, 2 males 70s, 2 females 80s, 5 males 80s, 1 female 90s, 1 male 90s
-DuPage County: 1 male 50s, 1 female 80s, 1 male 80s
-Kane County: 1 male 70s
-Lake County: 1 female 50s, 1 female 70s