Capacity limits on indoor dining and events will remain in place, officials said.
"We continue to see great progress in the ongoing fight against COVID-19, and I am thrilled that our metrics continue to move in the right direction," said Mayor Lori Lightfoot in a statement. "However, while we welcomed the return of limited indoor service last weekend, a rush to expand capacity too quickly would be irresponsible. With cases and positivity rates still higher than before the second surge, now is the time to keep safeguards in place to ensure continued progress and hopefully prevent any rollbacks in the future."
Chicago is able to move to Phase Four after meeting the state-imposed criteria, including a positivity rate less than or equal to 6.5% for three consecutive days.
Indoor capacity at bars, restaurants and events will remain limited to 25% or no more than 25 people. The indoor spaces can now seat six people at one table.
The sale of alcohol is prohibited after 11 p.m. and bars and restaurants must close by midnight.
Capacity for most other industries will remain at the lesser of 40% or less than 50 people.
Illinois health officials reported 2,428 new COVID-19 cases and 40 deaths Sunday.
If all the mitigation metrics continue to improve, Region 11, which covers Chicago, will move into Phase 4 of the Restore Illinois Plan on Sunday.
The total number of cases in Illinois now stands at 1,123,873, with a total of 19,203 deaths, since the start of the COVID-19 pandemic.
Within the past 24 hours, laboratories have reported 107,802 specimens for a total of 15,952,421..
RELATED: Illinois COVID vaccine map shows how many residents vaccinated by county
The preliminary seven-day statewide test positivity from Jan. 24-30, 2021 is 5.0%.
RELATED: Illinois coronavirus testing: Where to get tested for COVID-19 in Illinois, Chicago area
The test positivity rate is a metric the state began providing in late October. It is calculated by using the total number of positive tests over the total number of tests. This is the metric being used to by state health officials to make decisions about mitigations.
Chicago moving forward?
Find out how many people may get a COVID-19 vaccine before you
RELATED: Johnson & Johnson vaccine 85% effective against severe COVID-19 disease
Johnson & Johnson's long-awaited vaccine appears to protect against COVID-19 with just one shot - not as strong as some two-shot rivals, but still potentially helpful for a world in dire need of more doses.
J&J said Friday that in the U.S. and seven other countries, the single-shot vaccine was 66% effective overall at preventing moderate to severe illness, and much more protective - 85% - against the most serious symptoms.
In Chicago, health officials said they're receiving only about 35,000 vaccine doses a week, allowing them to administer only 5,000 doses a day, for vaccines that require two doses.
"The federal government is directing us to do first and second doses and to make sure everybody is getting the doses at the right period of time," Pritzker said.
Rather than vaccinating as many people as possible with the first dose, Gov. Pritzker said the state does keep vaccines in reserve for second doses.
IDPH reports that a total of 1,333,475 vaccine doses have been administered. The seven-day rolling average of vaccines administered is 42,931.
The IDPH says that vaccine distribution numbers are reported in real-time, and vaccine administration numbers lag by as much as 72 hours.
Pritzker said there are plans to launch walk-in locations once the supply of vaccine increases. He also announced the creation of a new portal, coronavirus.illinois.gov, to provide the latest information on vaccines.
As of Saturday night, 2,467 individuals in Illinois were reported to be in the hospital with COVID-19. Of those, 538 patients were in the ICU and 289 patients with COVID-19 were on ventilators.
The deaths reported Sunday include:
-Boone County: 1 female 80s
-Clinton County: 1 female 70s
-Cook County: 1 female 30s, 2 males 40s, 1 female 50s, 1 male 60s, 3 females 70s, 6 males 70s, 4 females 80s, 1 male 80s, 1 female 90s, 1 male 90s
-DeKalb County: 1 male 80s
-DuPage County: 1 female 60s, 1 female 70s
-Franklin County: 1 male 80s
-Kane County: 1 female 80s
-Lake County: 2 males 40s, 1 female 60s
-LaSalle County: 1 male 80s
-Madison County: 1 male 70s, 1 female 90s
-Marion County: 1 female 80s
-Monroe County: 1 male 60s
-Randolph County: 1 male 70s
-Rock Island County: 1 male 60s
-Will County: 1 teen
-Winnebago County: 1 female 80s
The Associated Press contributed to this report.