Gillsville is a city in Banks and Hall counties in the U.S. state of Georgia. The population was 235 at the 2010 census.The Hall County portion of Gillsville is part of the Gainesville, GA Metropolitan Statistical Area.Gillsville is located at 34°18′33″N 83°38′8″W / 34.30917°N 83.63556°W / 34.30917; -83.63556.According to the United States Census Bureau, the city has a total area of 1.1 square miles, all land.As of the census of 2000, there were 195 people, 79 households, and 57 families residing in the city. The population density was 171.3 people per square mile. There were 90 housing units at an average density of 79.1 per square mile. The racial makeup of the city was 99.49% White, and 0.51% from two or more races. Hispanic or Latino of any race were 1.54% of the population.There were 79 households out of which 30.4% had children under the age of 18 living with them, 67.1% were married couples living together, 5.1% had a female householder with no husband present, and 26.