How many people live in Effingham County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 34,600 people living in Effingham County, IL. That makes Effingham County the 41st-most populous county in Illinois. It is home to 0.27% of people living in the state.
34.6K
population of Effingham County, IL (2024)
0.27%
County share of the Illinois population (2024)
About 34,600 people lived in Effingham County, IL in 2024.
Population estimates, 2000–2024
What are Effingham County, IL’s age demographics?
About 6,800 Effingham County residents are aged 65 and older in 2024. That represents 19.7% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 8,200 Effingham County residents, or 23.7% 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 Effingham County, IL's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Effingham County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 94.4% of the Effingham County population, higher than the national share of 57.5%.
In contrast, Effingham County’s Hispanic population accounts for 3.1%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.61% 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.
Effingham 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 Effingham County, IL is Effingham with about 11,700 residents in 2024.
Cities and towns in Effingham County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Effingham (pt.) | 11,676 |
| 2. | Altamont | 2,200 |
| 3. | Teutopolis (pt.) | 1,562 |
| 4. | Dieterich | 879 |
| 5. | Union | 766 |
| 6. | Watson (pt.) | 631 |
| 7. | Moccasin | 491 |
| 8. | Lucas | 460 |
| 9. | West | 433 |
| 10. | Effingham (pt.) | 429 |
Keep exploring
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.
