Jefferson, GA has a population of 9,946 and is the 3,949th largest city in the United States. The population density is 452 per sq mi which is 171% higher than the Georgia average and 399% higher than the national average. The median age in Jefferson is 39 which is approximately 7% higher than the Georgia average of 36. In Jefferson, 64% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 65% of Jefferson residents were born in Georgia, 28% were born out of state, 2% were born outside of the United States and 5% were foreign born.