Public Holidays in Illinois, United States 2026

cURL

curl -X GET \
  "https://api.holidays.rest/v1/holidays?country=US&year=2026" \
  -H "Authorization: Bearer YOUR_API_KEY"

JavaScript — filter for Illinois

const res = await fetch(
  "https://api.holidays.rest/v1/holidays?country=US&year=2026",
  { headers: { Authorization: "Bearer YOUR_API_KEY" } }
);
const holidays = await res.json();
// Filter for Illinois (ISO code: IL)
const regional = holidays.filter(h =>
  !h.regions?.length || h.regions.includes("IL")
);