Chicago Influenza Vaccination Coverage by ZIP Code and Age

Chicago Department of Public Health provides weekly cumulative data on influenza vaccination coverage for residents aged 6 months and older. The dataset tracks individuals considered 'up to date' by ZIP Code and age group, using population estimates from the 2020 U.S. Decennial Census to calculate coverage percentages. Data originates from the Illinois Comprehensive Automated Immunization Registry Exchange (I-CARE) and is updated weekly.

Use Cases

• Monitoring weekly vaccination trends using Week End and Count columns
• Analyzing coverage disparities across ZIP Codes using Zip and Percent columns
• Comparing vaccination uptake by demographic groups using Age Group and Population Size columns
• Tracking cumulative progress over a flu season using Season and MMWR Week columns

Strengths

• Data is updated weekly, with a last update recorded on 2026-05-27
• Coverage calculations are based on specific 2020 U.S. Decennial Census population estimates
• Includes granular breakdowns by both ZIP Code and multiple Age Groups

Limitations

• Vaccination reporting is not mandatory in Illinois except for publicly funded vaccines, which likely introduces reporting gaps
• Coverage percentages are capped at 99% and may be inaccurate for ZIP Codes with small populations or where addresses are misreported
• Key metadata such as exact row count, file size, and license information is unavailable across all sources

Provenance

Source

Chicago Department of Public Health (CDPH)

Collection Method

Data provided by medical providers via the Illinois Comprehensive Automated Immunization Registry Exchange (I-CARE)

Time Range

Weekly data from July (MMWR week 27) through the following June (MMWR week 26) for each flu season

Freshness

Last updated 2026-05-27 15:07:34 on Socrata

Geography

Chicago residents, aggregated by ZIP Code