Grand Isle county comprises a group of islands in Lake Champlain, and a point of land jutting into the north part of that lake on the south side of the Canada line, on which Alburgh is situated. North Hero is the county town.

This county contains about eighty square miles; most of the land is level and excellent for grazing and tillage. Grand Isle has no considerable streams, but its navigable facilities are very great, It was first settled about the close of revolutionary war.

(Gazetteer of Vermont, by John Hayward, 1849, p. 66)