SBN's Illinois Yellow Pages

Search for businesses and maps online, get company addresses and phone numbers by name, area code, city or category.
http://www.sbn.com/states/IL.html

Testing Service Corporation

Provides a full range of geotechnical engineering, environmental services, and construction materials testing and observation from seven locations in Northern Illinois.
http://www.tsccorp.com/

Northern Illinois Business & Industry Data Center

Serves businesses and individuals in the 24-county Northern Illinois region including the Chicago, Kankakee, Rockford, and Quad Cities metro areas. It is designed to meet the growing need by decision makers for current and historical demographic and econo
http://www.nibidc.com/