California County-Level COVID-19 Vaccination Progress Data

County-level COVID-19 vaccination data for California, tracking metrics like 'Up to Date' status and primary series completion. The data originates from the state's Vaccine Progress Dashboard and includes notes on methodology changes, such as the shift to an 'Up to Date' measure in June 2023. It details coverage calculations for different age groups and notes exclusions for federal agency-administered doses.

Use Cases

• Analyze 'Up to Date' vaccination rates by county to identify geographic disparities in coverage.
• Track changes in 'primary series complete' metrics over time following shifts in CDC recommendations.
• Compare vaccination progress before and after the denominator change from age 5+ to all ages in July 2022.
• Model county-level vaccine uptake using equity scores derived from the Healthy Places Index (HPI) 3.0 economic and housing indicators.

Strengths

• Data is directly sourced from the official California COVID-19 Vaccine Progress Dashboard.
• Includes specific methodological details, such as the shift to an 'Up to Date' measure on June 16, 2023.
• Documents changes in denominator populations (e.g., age 5+ to all ages) for accurate rate calculation over time.

Limitations

• Excludes vaccination doses administered by federal agencies like the Indian Health Service and Veterans Health Administration.
• County-level sums do not equal statewide totals due to out-of-state residents vaccinated in California.
• Less than 1% of records use provider county instead of resident county, introducing minor geographic inaccuracy.

Provenance

Source

State of California, from the same source as the Vaccine Progress Dashboard.

Collection Method

Aggregated from vaccination records, with county assigned by residence or provider location.

Freshness

Last updated March 23, 2026.

Geography

County-level data for the state of California, United States.