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Illinois Federal Contractors
Search SAM.gov-registered federal contractors based in Illinois. Filter by NAICS code, certifications, small business status, and more — all via the GovData Labs API.
Search Illinois contractors
Use the state=IL parameter to filter results to Illinois. Combine with any other search parameter.
All contractors in IL
curl "https://api.govdatalabs.com/api/v2/data/entities/search?state=IL&limit=5" \
-H "X-API-Key: your_api_key"Small business cybersecurity firms in IL
curl "https://api.govdatalabs.com/api/v2/data/entities/search?state=IL&naics=541512&small_business=true&limit=5" \
-H "X-API-Key: your_api_key"Top industries in Illinois
Combine state and NAICS filters to find contractors by industry in Illinois.
541330
Engineering Services
541511Custom Computer Programming Services
541512Computer Systems Design Services
541611Administrative Management Consulting
541620Environmental Consulting Services
541715R&D in Engineering and Physical Sciences (except Nanotech and Biotech)
518210Data Processing and Hosting Services
236220Commercial and Institutional Building Construction
561210Facilities Support Services
561720Janitorial Services
Major federal agencies awarding in Illinois
These agencies award significant contract volume to Illinois-based contractors.
Get Illinois contractor data via API
Free sandbox — 100 requests/month, no credit card. Search all SAM.gov entities in IL and beyond.