Demographics 2020 census As of the 2020 United States census, there were 18,256 people, 6,966 households, and 4,998 families residing in the city. 2000 census As of the census of 2000, there were 13,761 people, 4,837 households, and 3,758 families residing in the city. The population density was . There were 5,351 housing units at an average density of . The racial makeup of the city was 72.78% White, 19.99% African American, 0.47% Native American, 1.21% Asian, 0.07% Pacific Islander, 1.56% from other races, and 2.09% from two or more races. Hispanic or Latino people of any race were 4.46% of the population. There were 4,837 households, out of which 47.8% had children under the age of 18 living with them, 59.8% were married couples living together, 14.2% had a female householder with no husband present, and 22.3% were non-families. 16.8% of all households were made up of individuals, and 2.9% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size was 3.18. In the city has a population with 33.4% under the age of 18, 11.2% from 18 to 24, 34.7% from 25 to 44, 15.6% from 45 to 64, and 5.2% who were 65 years of age or older. The median age was 28 years. For every 100 females, there were 97.8 males. For every 100 females age 18 and over, there were 95.3 males. The median income for a household in the city was $42,087, and the median income for a family was $46,065. Males had a median income of $35,419 versus $24,449 for females. The per capita income for the city was $18,099. About 9.6% of families and 11.2% of the population were below the poverty line, including 14.5% of those under age 18 and 7.1% of those age 65 or over. Gallery of photos See also Cumberland Island Duck House Orange Hall (St. Marys, Georgia) List of county seats in Georgia (U.S. state) St. Marys Historic District (Georgia) St. Marys Railroad St. Marys Airport St. Marys River Gilman Paper Company Battle of Fort Peter References External links St. Marys visitors website Radio Museum in St. Marys Cities in Camden County, Georgia Populated coastal places in Georgia (U.S. state) Populated places established in 1792 1792 establishments in Georgia (U.S. state) Micropolitan areas of Georgia (U.S. state) Cities in Georgia (U.S. state) Former county