According to theU.S. Census Bureau, the county has a total area of 404 square miles (1,050 km2), of which 400 square miles (1,000 km2) is land and 3.5 square miles (9.1 km2) (0.9%) is water.[4]
The majority of Long County, roughly centered onLudowici, is located in theAltamaha River sub-basin of the basin by the same name. The county's northeastern portion, east ofGlennville and northwest ofWalthourville, is located in theCanoochee River sub-basin of theOgeechee River basin. Long County's southeastern portion is located in the Ogeechee Coastal sub-basin of the larger Ogeechee basin.[5]
As of the2020 census, the county had a population of 16,168, 5,492 households, and 4,146 families residing in the county.[16][17] The median age was 31.8 years, 30.5% of residents were under the age of 18, and 9.5% of residents were 65 years of age or older.[17] For every 100 females there were 98.6 males, and for every 100 females age 18 and over there were 97.9 males age 18 and over.[17] 19.8% of residents lived in urban areas, while 80.2% lived in rural areas.[16]
There were 5,492 households in the county, of which 43.6% had children under the age of 18 living with them and 23.6% had a female householder with no spouse or partner present. About 21.5% of all households were made up of individuals and 6.9% had someone living alone who was 65 years of age or older.[17]
There were 6,180 housing units, of which 11.1% were vacant. Among occupied housing units, 64.5% were owner-occupied and 35.5% were renter-occupied. The homeowner vacancy rate was 1.8% and the rental vacancy rate was 14.5%.[17]
Long County School System operates public schools for grades Pre-K-12 in the county, except parts inFort Stewart. Fort Stewart has theDepartment of Defense Education Activity (DoDEA) as its local school district,[20] for the elementary level.[21] Students at the secondary level on Fort Stewart attend public schools operated by county school districts.[22]