Union City, GA has a population of 20,560 and is the 2,110th largest city in the United States. The population density is 1,048 per sq mi which is 461% higher than the Georgia average and 1057% higher than the national average. The median age in Union City is 31 which is approximately 14% lower than the Georgia average of 36. In Union City, 33% of the population over 15 years of age are married, 92% speak English and 5% speak Spanish. 59% of Union City residents were born in Georgia, 35% were born out of state, 1% were born outside of the United States and 5% were foreign born.