Glencoe is a village in Cook County, Illinois, United States. Glencoe is located on suburban Chicago's North Shore. Glencoe is located within the New Trier High School District. Glencoe is regarded as one of the most affluent suburbs on Chicago's North shore. According to the United States Census Bureau, the village has a total area of 3.8 square miles (9.8km2), of which, 3.8 square miles (9.8km2) of it is land and 0.1 square miles (0.26km2) of it (1.82%) is water.