Illinois State Data — United States (US)
Illinois (IL) is a state of United States (US) with capital Springfield. Get Illinois cities, zip codes and geographic data via the Country Data API REST endpoints. Query by country code 'US' and state code 'IL'. Free to start, JSON, plans from $9.99/mo.
Get Illinois cities and zip codes via API
Use the United States country code US and the state code IL to query Illinois-specific geographic data.
Cities in Illinois
All cities and localities in Illinois, United States
Zip / Postal Codes in Illinois
Complete postal code dataset for Illinois
All states of United States
List every state/province in United States
API Request Example
Fetch cities in Illinois (IL) via the REST API.
Cities by state
GET https://api.countrydataapi.com/v1/cities/by-state?country=US&state=ILAuthorization: Bearer YOUR_API_KEY
cURL example
curl "https://api.countrydataapi.com/v1/zipcode/by-state?country=US&state=IL" -H "Authorization: Bearer YOUR_KEY"Cities in Illinois
More states of United States
Access Illinois cities & zip codes via API
Integrate Illinois (United States) geographic data into your application. One API for all countries, states, cities and zip codes.