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Carroll County, Maryland COVID-19 Cases

Carroll County is in HIGH transmission according to CDC County Data

Please note that we will be updating Carroll County case data below once a week on Tuesdays. Click here for vaccination data.

Total Carroll County COVID-19 Cases: 10,639 (+224 since 9/14)
Total fatalities: 279 (+3 since 9/14)
7 Day Moving Average Case Rate per 100,000 as of 9/21: 19.85**
Positivity Rate in Carroll County as of 9/21: 5.11%**
Probable Cases: 4,143  (Net +126 since 9/14)***

*These totals include all community cases, all cases in residents in county congregate facilities, and all staff cases in these facilities who live in Carroll County. All data is preliminary and subject to change.
**The case rate per 100,000 and the percent positive rate are seven day rolling averages according to Maryland Department of Health data. For Carroll data over time, see the second row, right-hand graph at
***People who tested positive with an antigen test, not a molecular test. Antigen tests are currently considered “presumptive laboratory evidence” according to the CDC’s case definition for COVID-19, so these cases will not be included in our data totals. However, we are tracking these cases, isolating and contact tracing the individuals to prevent further spread, and recommending follow-up testing with the molecular test (the type offered at state sites, including the Ag Center). Cases who test positive with a molecular test will be considered confirmed and removed from the “probable case” totals.
For more information, please visit the Maryland Department of Health Coronavirus (COVID-19) dashboard.

The CDC is tracking community transmission in each county in the United States using two metrics, positivity rate and total new cases per 100,000 in the past 7 days.

Levels of community transmission as defined by the CDC:
– Total new cases per 100,000 in past 7 days: low <10, moderate 10-49, substantial 50-99, high >= 100
– Percent positive tests in past 7 days: low <5%, moderate 5-7.9%, substantial 8-9.9%, high >=10%

– If the two indicators suggest different transmission levels, the higher level is selected.

To see county transmission levels and positivity rates across the country, see the CDC’s COVID-19 Data Tracker. The CDC data is updated daily at 8 pm. Our case data will be updated weekly. The data may be slightly different due to data sources and updates.

Please note the excess probable cases the week of 5/9 were due to a reporting delay from a testing facility and probable cases were not complete for the week of 8/29 due to the holiday weekend.

This graph shows hospitalizations by week for COVID positive Carroll County residents, in any hospital. •Report week is the week their case was reported, which may not be the same week they were hospitalized. Only one hospitalization is noted per person. •There is a slight data lag so recent numbers may increase.



Post-Vaccination Infections

Vaccines are an effective and critical tool to bring the pandemic under control by helping to prevent
infection, serious illness, hospitalization and death due to COVID-19. Although there are cases of
people who become sick after they are fully vaccinated, cases where fully vaccinated people are
hospitalized or die from COVID-19 are rare and vaccines remain the best way to prevent COVID-19 and
its complications.

Maryland’s first post-vaccination infection was identified on January 26, 2021. The information
below reflects Carroll County cases reported from January 26 – September 14, 2021.

102,619 (60.9%) of all Carroll County residents have been fully vaccinated as of September 14, 2021.

There have been 325 COVID-19 cases among fully vaccinated Carroll County residents since January 26, 2021.

Of those cases, there were:

  • 32 cases hospitalized, representing 9.6% of all COVID-19 cases in Carroll County who were hospitalized since January 26, 2021
  • 8 deaths, representing 17.8% of all lab-confirmed COVID-19 deaths in Carroll County since January 26, 2021*
*Because our number of deaths is low (45 since January 26, 2021), it is difficult to make conclusions based on vaccination status.

Approximately 8.7% of all confirmed COVID-19 cases in Carroll County since January 26, 2021 have been among fully vaccinated individuals.  

Note: All data are preliminary and subject to change based on additional reporting. Due to different reporting timeframes and other selection criteria, there may be differences between the data presented here and elsewhere on this page.

People are considered fully vaccinated 14 days after receiving the last required dose of an FDA-authorized COVID-19 vaccine. Post-vaccination infections are identified when SARS-CoV-2 RNA is detected in a specimen collected at least 14 days after receipt of the last required dose of vaccine. Identification of post-vaccination infections requires that vaccination data be reported to the state immunization registry and that the vaccination record can be matched to the SARS-CoV-2 test result. Therefore, post-vaccination infections may be undercounted.

Community case totals and information

Click the link above for information about community cases in Carroll County, not including congregate living facility cases.

Congregate Living Facility case totals and information

Click the link above for active outbreaks and total cases in county facilities.

For information on cases in Maryland, visit

State information from the Maryland Department of Health (MDH)

Frequently Asked Questions: Guidance for Schools About the Novel Coronavirus (COVID-19)

U.S. Information from the Centers for Disease Control and Prevention (CDC)

Global information from World Health Organization (WHO)

Carroll County’s COVID-19 call center line is 410-876-4848 and is open 8-5 , Monday-Friday. After hours, people can leave a message that will be returned the next business day. For hotline and website information in different counties, visit our County Health Department COVID-19 Hotlines and Websites Page