Search for Lake Barrington homes for sale with Corrine Guest, the best Barrington Illinois Real Estate Agent. The village of Lake Barrington is located in Lake County, Illinois and is home to nearly 5,000 residents. The area is a dedicated tree city and a country suburban village with lots of country walking trails that provide a healthy environment for active residents and growing families. The Lake Barrington area features a diverse array of properties. From small cottages, to modern mansions, to large luxury homes on vast acreage.