How many people live in Marengo County, AL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 18,500 people living in Marengo County, AL. That makes Marengo County the 47th-most populous county in Alabama. It is home to 0.36% of people living in the state.
18.5K
population of Marengo County, AL (2024)
0.36%
County share of the Alabama population (2024)
About 18,500 people lived in Marengo County, AL in 2024.
Population estimates, 2000–2024
What are Marengo County, AL’s age demographics?
About 4,000 Marengo County, AL residents are aged 65 and older in 2024. That represents 21.6% of its population. For comparison, the age group represents 18.6% of Alabama’s population and 18% in the US overall.
Another 4,100 Marengo County residents, or 22.2% of the population, were children under 18. For comparison, the age group represents 22.1% of Alabama’s population and 21.6% in the US overall.
A lower share of Marengo County, AL's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Marengo County, AL’s racial and ethnic demographics?
Non-Hispanic Black or African American residents make up 51.3% of the Marengo County, AL population, higher than the national share of 12.6%.
In contrast, Marengo County’s Hispanic population accounts for 3.4%, below the 20% nationwide, and the non-Hispanic white population makes up 43.7% of the county, compared with 57.5% 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.
Marengo County, AL has a higher share of a non-Hispanic Black or African American population than Alabama as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Marengo County, AL is Demopolis with about 6,700 residents in 2024.
Cities and towns in Marengo County, AL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Demopolis | 6,724 |
| 2. | Linden | 1,815 |
| 3. | Thomaston | 311 |
| 4. | Sweet Water | 216 |
| 5. | Providence | 162 |
| 6. | Faunsdale | 82 |
| 7. | Myrtlewood | 68 |
| 8. | Dayton | 28 |
| 9. | Balance of Marengo County | 9,106 |
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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.
