Illinois is one of the most populated states in the country, and this factor means that there are ample Illinois commercial real estate listings. Many of these commercial property listings are based in its largest city Chicago. This fact can only be expected, as Chicago is the third most populated city in the entire country.

The Chicago area is the home to 75% of the people who live in the entire state of Illinois, which has an estimated population of 12.74 million people. Other cities with notable Illinois commercial real estate listings include Aurora, Rockford and Joliet.

Agricultural products like corn, soybeans, cattle, wheat and dairy make up some of the state's rural commercial land. Manufacturing is also key for the state's economy. Since 38% of the state's manufacturing plants are located in Cook County, there is a great deal of commercial property in this region. Products manufactured include chemicals, machines, food, fabricated metal, electronics, plastics and transportation equipment.