Collins is a city in Tattnall County, Georgia, United States. The population was 540 in 2020. A post office called Collins has been in operation si…Collins is a city in Tattnall County, Georgia, United States. The population was 540 in 2020. A post office called Collins has been in operation since 1890. The Georgia General Assembly incorporated Collins as a town in 1894, and as a city in 1905. The community was named after Perry Collins, an early settler.