ST. CHARLES COUNTY, Mo. ( - St. Charles County reported 170 new cases of COVID-19 on Monday, its largest single-day increase.

Increasing COVID cases by zipcode

Over a two-week period, there has been a 370% increase in cases. People in their 20s account for nearly 23% of all COVID-19 cases in St. Charles County, the highest percentage among age groups.

[READ: Tracking COVID-19: Breaking down cases in Missouri and Illinois]

Dr. Alex Garza with the St. Louis Metropolitan Pandemic Task Force says St. Charles County has seen the most rapid growth of COVID-19 in St. Louis area over the past seven days.

Garza also says the number of cases is increasing in urban, suburban and rural parts of the area.

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