Hiltonia is a city in Screven County, Georgia, United States. The population was 310 in 2020. According to the United States Census …Hiltonia is a city in Screven County, Georgia, United States. The population was 310 in 2020. According to the United States Census Bureau, the city has a total area of 1.7 square miles, of which 1.7 square miles is land and 0.57% is water.