How many people live in Cobb County, GA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 787,500 people living in Cobb County, GA. That makes Cobb County the third-most populous county in Georgia. It is home to 7% of people living in the state.
788K
population of Cobb County, GA (2024)
7%
County share of the Georgia population (2024)
About 787,500 people lived in Cobb County, GA in 2024.
Population estimates, 2000–2024
What are Cobb County, GA’s age demographics?
About 114,400 Cobb County, GA residents are aged 65 and older in 2024. That represents 14.5% of its population. For comparison, the age group represents 15.8% of Georgia’s population and 18% in the US overall.
Another 172,400 Cobb County residents, or 21.9% of the population, were children under 18. For comparison, the age group represents 22.8% of Georgia’s population and 21.6% in the US overall.
A lower share of Cobb County, GA's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Cobb County, GA’s racial and ethnic demographics?
Non-Hispanic Black or African American residents make up 27.9% of the Cobb County, GA population, higher than the national share of 12.6%.
In contrast, Cobb County’s non-Hispanic white population accounts for 47.6%, below the 57.5% nationwide, and the Hispanic population makes up 15.8% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Cobb County, GA has a higher share of a Hispanic population than Georgia as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Cobb County, GA is Mableton with about 78,300 residents in 2024.
Cities and towns in Cobb County, GA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Mableton | 78,314 |
| 2. | Marietta | 63,122 |
| 3. | Smyrna | 57,177 |
| 4. | Kennesaw | 37,740 |
| 5. | Acworth | 22,624 |
| 6. | Powder Springs | 19,632 |
| 7. | Austell (pt.) | 8,117 |
| 8. | Roswell (pt.) | |
| 9. | Balance of Cobb County | 500,812 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
