Pennsylvania COVID-19 Vaccination Rates by County of Residence

Aggregate data of COVID-19 vaccines administered to Pennsylvania citizens based on county of residence. The dataset includes counts and per-100,000 rates for partially vaccinated, fully vaccinated, and multiple booster dose categories. Data is sourced from the Pennsylvania Statewide Immunization Information System (PA-SIIS) and was last updated on July 22, 2025.

Use Cases

• Analyze disparities in full vaccination coverage using County Name and Rate Fully Vaccinated per 100,000.
• Model the uptake of booster doses across counties using First Booster Dose, Second Booster Dose, and Bivalent Booster 1 columns.
• Compare initial vaccine series initiation to completion rates using Partially Vaccinated and Fully Vaccinated counts.
• Calculate vaccination rates relative to population size using County Population alongside the various rate columns.

Strengths

• Data is sourced from the authoritative state immunization registry (PA-SIIS).
• Includes 12 distinct columns covering population, raw counts, and normalized rates for multiple vaccination stages.
• Provides per-100,000 population rates for key metrics, enabling standardized comparisons.

Limitations

• Weekly updates concluded with the June 28th update, indicating the dataset is no longer being actively refreshed.
• Suppression is applied for quantities less than 5, which may obscure data for small counties or rare categories.
• Row count and total data size are unknown, which may limit suitability assessment for large-scale modeling.

Provenance

Source

Pennsylvania Statewide Immunization Information System (PA-SIIS), via data.pa.gov.

Collection Method

Aggregated from vaccine administration records reported to the state registry.

Freshness

Last updated 2025-07-22 18:52:54; weekly updates have concluded.

Geography

Pennsylvania, United States, at the county level.