Reporting of new Aggregate Case and Death Count data was discontinued May 11, 2023, with the expiration of the COVID-19 public health emergency declaration. This dataset will receive a final update on June 1, 2023, to reconcile historical data through May 10, 2023, and will remain publicly available.
Aggregate Data Collection Process
Since the start of the COVID-19 pandemic, data have been gathered through a robust process with the following steps:
- A CDC data team reviews and validates the information obtained from jurisdictions’ state and local websites via an overnight data review process.
- If more than one official county data source exists, CDC uses a comprehensive data selection process comparing each official county data source, and takes the highest case and death counts respectively, unless otherwise specified by the state.
- CDC compiles these data and posts the finalized information on COVID Data Tracker.
- County level data is aggregated to obtain state and territory specific totals.
This process is collaborative, with CDC and jurisdictions working together to ensure the accuracy of COVID-19 case and death numbers. County counts provide the most up-to-date numbers on cases and deaths by report date. CDC may retrospectively update counts to correct data quality issues.
Relation to Archived Dataset
Prior to October 20, 2022, CDC collected aggregate case and death data at the state level. This data was compiled and published daily on data.cdc.gov in a dataset called
United States COVID-19 Cases and Deaths by State over Time. As of 10/20/2022, this dataset has been archived and will no longer update.
Methodology Changes
Several differences exist between the current, weekly-updated dataset and the archived version of the
United States COVID-19 Cases and Deaths by State over Time dataset:
- Source: The current Weekly-Updated Version is based on county-level aggregate count data, while the Archived Version is based on State-level aggregate count data.
- Confirmed/Probable Cases/Death breakdown: While the probable cases and deaths are included in the total case and total death counts in both versions [if applicable], they were reported separately from the confirmed cases and deaths by jurisdiction in the Archived Version. In the current Weekly-Updated Version, the counts by jurisdiction are not reported by confirmed or probable status [See Confirmed and Probable Counts section for more detail].
- Time Series Frequency: The current Weekly-Updated Version contains weekly time series data [i.e., one record per week per jurisdiction], while the Archived Version contains daily time series data [i.e., one record per day per jurisdiction].
- Update Frequency: The current Weekly-Updated Version is updated weekly, while the Archived Version was updated twice daily up to October 20, 2022.
Important note: The counts reflected during a given time period in this dataset may not match the counts reflected for the same time period in the archived dataset noted above. Discrepancies may exist due to differences between county and state COVID-19 case surveillance and reconciliation efforts.
Confirmed and Probable Counts
In this dataset, counts by jurisdiction are not displayed by confirmed or probable status. Instead, confirmed and probable cases and deaths are included in the Total Cases and Total Deaths columns, when available. Not all jurisdictions report probable cases and deaths to CDC.* Confirmed and probable case definition criteria are described here:
Council of State and Territorial Epidemiologists [ymaws.com].
Deaths
CDC reports death data on other sections of the website:
CDC COVID Data Tracker: Home,
CDC COVID Data Tracker: Cases, Deaths, and Testing, and
NCHS Provisional Death Counts. Information presented on the COVID Data Tracker pages is based on the same source [total case counts] as the present dataset; however, NCHS Death Counts are based on death certificates that use information reported by physicians, medical examiners, or coroners in the cause-of-death section of each certificate. Data from each of these pages are considered provisional [not complete and pending verification] and are therefore subject to change. Counts from previous weeks are continually revised as more records are received and processed.
Number of Jurisdictions Reporting
There are currently 60 public health jurisdictions reporting cases of COVID-19. This includes the 50 states, the District of Columbia, New York City, the U.S. territories of American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, Puerto Rico, and the U.S Virgin Islands as well as three independent countries in compacts of free association with the United States, Federated States of Micronesia, Republic of the Marshall Islands, and Republic of Palau. New York State’s reported case and death counts do not include New York City’s counts as they separately report nationally notifiable conditions to CDC.
CDC COVID-19 data are available to the public as summary or aggregate count files, including total counts of cases and deaths, available by state and by county. These and other data on COVID-19 are available from multiple public locations, such as:
https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/cases-in-us.html
https://www.cdc.gov/covid-data-tracker/index.html
https://www.cdc.gov/coronavirus/2019-ncov/covid-data/covidview/index.html
https://www.cdc.gov/coronavirus/2019-ncov/php/open-america/surveillance-data-analytics.html
Additional COVID-19 public use datasets, include line-level [patient-level] data, are available at: https://data.cdc.gov/browse?tags=covid-19.
Archived Data Notes:
November 3, 2022: Due to a reporting cadence issue, case rates for Missouri counties are calculated based on 11 days’ worth of case count data in the Weekly United States COVID-19 Cases and Deaths by State data released on November 3, 2022, instead of the customary 7 days’ worth of data.
November 10, 2022: Due to a reporting cadence change, case rates for Alabama counties are calculated based on 13 days’ worth of case count data in the Weekly United States COVID-19 Cases and Deaths by State data released on November 10, 2022, instead of the customary 7 days’ worth of data.
November 10, 2022: Per the request of the jurisdiction, cases and deaths among non-residents have been removed from all Hawaii county totals throughout the entire time series. Cumulative case and death counts reported by CDC will no longer match Hawaii’s COVID-19 Dashboard, which still includes non-resident cases and deaths.
November 17, 2022: Two new columns, weekly historic cases and weekly historic deaths, were added to this dataset on November 17, 2022. These columns reflect case and death counts that were reported that week but were historical in nature and not reflective of the current burden within the jurisdiction. These historical cases and deaths are not included in the new weekly case and new weekly death columns; however, they are reflected in the cumulative totals provided for each jurisdiction. These data are used to account for artificial increases in case and death totals due to batched reporting of historical data.
December 1, 2022: Due to cadence changes over the Thanksgiving holiday, case rates for all Ohio counties are reported as 0 in the data released on December 1, 2022.
January 5, 2023: Due to North Carolina’s holiday reporting cadence, aggregate case and death data will contain 14 days’ worth of data instead of the customary 7 days. As a result, case and death metrics will appear higher than expected in the January 5, 2023, weekly release.
January 12, 2023: Due to data processing delays, Mississippi’s aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the January 12, 2023, weekly release.
January 19, 2023: Due to a reporting cadence issue, Mississippi’s aggregate case and death data will be calculated based on 14 days’ worth of data instead of the customary 7 days in the January 19, 2023, weekly release.
January 26, 2023: Due to a reporting backlog of historic COVID-19 cases, case rates for two Michigan counties [Livingston and Washtenaw] were higher than expected in the January 19, 2023 weekly release.
January 26, 2023: Due to a backlog of historic COVID-19 cases being reported this week, aggregate case and death counts in Charlotte County and Sarasota County, Florida, will appear higher than expected in the January 26, 2023 weekly release.
January 26, 2023: Due to data processing delays, Mississippi’s aggregate case and death data will be reported as 0 in the weekly release posted on January 26, 2023.
February 2, 2023: As of the data collection deadline, CDC observed an abnormally large increase in aggregate COVID-19 cases and deaths reported for Washington State. In response, totals for new cases and new deaths released on February 2, 2023, have been displayed as zero at the state level until the issue is addressed with state officials. CDC is working with state officials to address the issue.
February 2, 2023: Due to a decrease reported in cumulative case counts by Wyoming, case rates will be reported as 0 in the February 2, 2023, weekly release. CDC is working with state officials to verify the data submitted.
February 16, 2023: Due to data processing delays, Utah’s aggregate case and death data will be reported as 0 in the weekly release posted on February 16, 2023. As a result, case and death metrics will appear lower than expected and should be interpreted with caution.
February 16, 2023: Due to a reporting cadence change, Maine’s aggregate case data may contain less than the customary 7 days’ worth of data in the February 16, 2023, release.
February 23, 2023: Due to data processing delays, Hawaii’s aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the February 23, 2023, weekly release.
March 9, 2023: Due to data processing delays, Utah's aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 9, 2023, weekly release.
March 9, 2023: Due to technical difficulties, Washington State's aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 9, 2023, weekly release.
March 9, 2023: Due to technical difficulties, Florida's aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 9, 2023, weekly release.
March 16, 2023: In coordination with Florida health officials, CDC completed a historical correction to address a technical issue affecting aggregate COVID-19 cases reported by Florida between November 2022 and March 2023.
March 16, 2023: Due to technical difficulties, Arkansas’s aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 16, 2023, weekly release.
March 16, 2023: Due to potential technical difficulties that are being reviewed with the state, Texas's aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 16, 2023, weekly release.
March 16, 2023: Due to technical difficulties, Indiana's aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 16, 2023, weekly release.
March 23, 2023: Due to technical difficulties, Indiana's aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 23, 2023, weekly release.
March 23, 2023: CDC is working together with colleagues from the Texas Department of State Health Services to accurately reflect the results of a 2021 reconciliation process for COVID-19 cases and deaths. As of the data collection deadline, a solution was not able to be finalized. Texas’s aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 23, 2023, weekly release.
March 23, 2023: Due to maintenance to Arkansas’s COVID-19 dashboard, aggregate case and death data will be reported as 0. As a result, case and death metrics will appear lower than expected in the March 23, 2023, weekly release.
March 23, 2023: The case counts reported for Florida at the state level may be artificially increased due to a technical issue; CDC is working with Florida Department of Health officials to address the potential issue.
March 30, 2023: Due to potential technical issues, Florida was unable to report aggregate case and death data to CDC. As a result, case and death metrics will be reported as 0 in the March 30, 2023, weekly release.
March 30, 2023: Due to technical difficulties, Delaware was unable to report aggregate case and death data to CDC. As a result, case and death metrics will be reported as 0 in the March 30, 2023, weekly release.
March 30, 2023: Due to data processing delays, Mississippi was unable to report aggregate case and death data to CDC. As a result, case and death metrics will be reported as 0 in the March 30, 2023, weekly release.
March 30, 2023: Due to changes in the state health department’s COVID-19 surveillance system, Oklahoma’s aggregate case data at state and county levels may be affected in the March 30, 2023, weekly release.
March 30, 2023: CDC and Texas have worked together to accurately reflect aggregate case data reconciliation efforts performed by the state on COVID Data Tracker. The current update reflects changes the jurisdiction has made to their state and county-level trend data.
April 6, 2023: Due to data processing delays, Mississippi was unable to report aggregate case and death data to CDC. As a result, case and death metrics will be reported as 0 in the April 6, 2023, weekly release.
April 6, 2023: Due to changes in Oklahoma’s COVID-19 surveillance system, aggregate case and death data reported for March 30, 2023, are based on 14 days’ worth of data instead of the customary 7 days. Aggregate data at both the state and county levels are affected. Therefore, aggregate case and death counts may be overestimated and should be interpreted with caution.
April 6, 2023: Due to ongoing technical improvements in Florida’s surveillance system, the Florida Department of Health has requested a temporary pause on submitting COVID-19 data to CDC. As a result, case and death metrics will be reported as 0 in the April 6, 2023, weekly release.
April 6, 2023: Due to a technical issue, aggregate death counts for all Washington counties will appear higher than expected in the April 6, 2023, weekly release. As a result, they should be interpreted with caution. Aggregate death counts at the state level are not affected.
April 6, 2023: As of April 1st, 2023, the state of Iowa no longer reports aggregate COVID-19 case or death data to CDC. As a result, aggregate counts from Iowa will no longer be reported at the national, regional, state or county-levels on COVID Data Tracker or data.cdc.gov. For additional information, please see the
press release published by the Iowa Department of Health and Human Services.
April 13, 2023: Due to ongoing technical improvements in Florida’s surveillance system, the Florida Department of Health has requested a temporary pause on submitting COVID-19 data which went into effect during the release on March 30, 2023. As a result, case and death metrics will be reported as 0 until reporting can resume.
April 20, 2023: The following jurisdictions were unable to report aggregate case and death data to CDC: Arkansas, Florida, Iowa, Mississippi, and Pennsylvania. As a result, case and death metrics will be reported as 0 or NA in the April 20, 2023, weekly release.
April 27, 2023: Due to a backlog of historic COVID-19 cases being reported this week, aggregate case counts in Louisiana counties may appear higher than expected in the April 27, 2023, release.
April 27, 2023: Due to a backlog of historic COVID-19 cases being reported this week, case rates for many counties in Indiana will appear higher than expected in the data released on April 27, 2023.
April 27, 2023: The following jurisdictions were unable to report aggregate case and death data to CDC: Florida, Iowa and Pennsylvania. As a result, case and death metrics will be reported as 0 or N/A in the April 27, 2023, weekly release.
May 4, 2023: Due to a backlog of historic COVID-19 cases being reported this week, case rates for some counties in Indiana, including Jay, Lawrence, Orange, and White Counties, will appear higher than expected in the weekly data released on May 4, 2023.
May 4, 2023: The following jurisdictions were unable to report aggregate case and death data to CDC: Florida, Iowa, and Mississippi. As a result, case and death metrics will be reported as 0 or N/A in the May 4, 2023, weekly release.
May 11, 2023: The following jurisdictions were unable to report aggregate case and death data to CDC: Iowa, Indiana, Mississippi, Oregon. As a result, case and death metrics will be reported as 0 or N/A for May 11, 2023.
May 11, 2023: The Florida Department of Health has completed a series of technical improvements to their surveillance system and resumed reporting to CDC. Due to the gap in reporting, aggregate new death counts were marked as historical at the state-level; however, death counts at the county level could not be marked as historical level due to data pipeline constraints and will appear higher than expected.
May 11, 2023: Due to a potential change in reporting for Illinois, aggregate case will appear lower than expected and aggregate death counts will be reported as 0 for May 11, 2023. CDC is working with state officials to verify the data submitted.
