Grand Isle County is a county in the U.S. state of Vermont. As of the 2020 census, the population was 7,293, making it Vermont's second-least populous county. Its shire town is North Hero. The county was created in 1802 and organized in 1805. Grand Isle County is part of the Burlington metropolitan area. The county does not have a high school; students choose from a number of high schools in neighboring counties..