For the most complete and up-to-date data for any particular county or state, visit the relevant health department website. Vaccination data reported on the CDC COVID Data Tracker might differ from data reported by jurisdictions for a number of reasons. For example: Data quality: CDC receives administration data across multiple jurisdictions with different reporting practices. To reduce potential duplication across systems, CDC reconciles these data prior to reporting. Data completeness: Jurisdictions may have more complete and updated data for certain data elements (e.g., county of residence) that allow them to characterize their population more fully than the CDC. Thus, vaccination coverage reported on the CDC COVID Data Tracker may appear artificially low due to systematic missing data reported to CDC. Data availability: Data on the CDC COVID Data Tracker represent all vaccine partners including jurisdictional partner clinics, retail pharmacies, long-term care facilities, dialysis centers, Federal Emergency Management Agency and Health Resources and Services Administration partner sites, and federal entity facilities. These additional data streams may not be available to jurisdictions and therefore may not be included in totals presented on jurisdictional dashboards. Data definition: CDC’s COVID Data Tracker attributes dose administrations to the jurisdiction (state, territory, tribe, or local entity) administering those doses and attributes people receiving COVID-19 vaccine to the jurisdiction where the vaccine recipient resides. Additionally, CDC estimates the number of people receiving at least one dose, the number of people who are fully vaccinated, and the number of people with a booster dose. CDC estimates are based on data reported by jurisdictions that includes a dose number (first, second, booster or additional dose). This may differ from how jurisdictions attribute their doses. Population definition: CDC includes all age groups in the Total Population calculations to provide a better measure of community immunity. Jurisdictions may use more targeted population counts for the denominators in their rate calculations (for example, people over age 18), which would result in values different than those reported on the CDC COVID Data Tracker