Kennesaw, GA has a population of 32,669 and is the 1,300th largest city in the United States. The population density is 3,400 per sq mi which is 1936% higher than the Georgia average and 3652% higher than the national average. The median age in Kennesaw is 35 which is approximately 5% lower than the Georgia average of 36. In Kennesaw, 50% of the population over 15 years of age are married, 80% speak English and 10% speak Spanish. 35% of Kennesaw residents were born in Georgia, 47% were born out of state, 3% were born outside of the United States and 15% were foreign born.