How many people live in Putnam County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 5,600 people living in Putnam County, IL. That makes Putnam County the 94th-most populous county in Illinois. It is home to 0.04% of people living in the state.
5.63K
population of Putnam County, IL (2024)
0.04%
County share of the Illinois population (2024)
About 5,600 people lived in Putnam County, IL in 2024.
Population estimates, 2000–2024
What are Putnam County, IL’s age demographics?
About 1,500 Putnam County, IL residents are aged 65 and older in 2024. That represents 26.4% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 1,100 Putnam County residents, or 18.7% of the population, were children under 18. For comparison, the age group represents 21.2% of Illinois’s population and 21.6% in the US overall.
A higher share of Putnam County, IL's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Putnam County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 90.1% of the Putnam County, IL population, higher than the national share of 57.5%.
In contrast, Putnam County’s Hispanic population accounts for 7.1%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.71% of the county, compared with 12.6% 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.
Putnam County, IL has a higher share of a non-Hispanic white population than Illinois as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Putnam County, IL is Granville with about 1,300 residents in 2024.
Cities and towns in Putnam County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Granville | 1,331 |
| 2. | Hennepin | 747 |
| 3. | Senachwine | 629 |
| 4. | Mark | 507 |
| 5. | McNabb | 274 |
| 6. | Magnolia | 254 |
| 7. | Standard | 222 |
| 8. | Balance of Granville | 693 |
| 9. | Balance of Hennepin | 492 |
| 10. | Balance of Magnolia | 484 |
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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.
