Lincolnshire is a village in the Vernon Township region of Lake County, in the U.S. state of Illinois. The village is a suburb of Chicago, a city in the adjacent Cook County. Its population was 6,108 at the time of the 2000 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.