The city of Lexington has a population of approximately 2100 people. The school district is a unit district that encompasses 83 square miles around and including the city of Lexington. The Lexington School District is located in and around a small rural community situated along Interstate 55 North of the Twin Cities of Bloomington-Normal. The city of Lexington has a population of approximately 2100 people. The school district is a unit district that encompasses 83 square miles around and including the city of Lexington. Most of the land use is agricultural with a portion used for public or commercial business. There are a variety of activities to do in Lexington with the 2 walking/biking trails, multiple parks, pools and churches.