Deerfield is a village in Lake County, Illinois, United States, approximately 25 miles north of Chicago with a small portion extending into Cook County, Illinois. The population was 18,225 at the 2010 census.
Deerfield is home to the headquarters of Walgreens, Baxter Healthcare, Business Technology Partners, Caterpillar Inc., APAC Customer Services, Fortune Brands Home & Security, Takeda Pharmaceutical Company's US HQ, Consumers Digest, and Mondelēz International.