Lincolnshire is a village in Vernon Township, Lake County, in the U.S. state of Illinois. The village is a northern suburb of Chicago. The population of Lincolnshire was 7,275 at the 2010 census. Lincolnshire was incorporated on August 5, 1957, from the unincorporated Half Day area when land was purchased to build a residential subdivision. The community underwent an aggressive era of expansion from 1983 to the 1990s. The Des Plaines River bisects the village, passing from north to south; Illinois Route 22 also divides the village into two parts, crossing the village from east to west.Lincolnshire is home to the public Adlai E. Stevenson High School and to the schools that compose the elementary Lincolnshire-Prairie View School District 103. It serves as the headquarters for corporations including the global outsourcing company Aon Hewitt, and was the base of operations for the Newman/Haas Racing team.