1. On June 3, 1832, the first land office in Chicago opened. It was created to serve as the center for the growing population and for those looking to purchase land in the expanding city.

2. The first Women's Army Auxiliary Corps (WAAC) training center in the United States was established in Des Plaines, Illinois, on June 3, 1942. The facility trained women who would go on to serve in World War II.

3. On June 3, 1965, Major League Baseball player Jim "Catfish" Hunter made his debut with the Kansas City Athletics against the Chicago White Sox. He would go on to have a successful career and be inducted into the Baseball Hall of Fame in 1987.

4. The Illinois State Archives officially opened on June 3, 2000. It serves as the repository for Illinois government records and historical documents, and contains over 75,000 cubic feet of records dating back to 1818.

5. In 2018, the Illinois General Assembly passed a bill on June 3 legalizing the use of recreational marijuana in the state. The bill went into effect on January 1, 2020, making Illinois the 11th state in the United States to legalize marijuana for recreational use.