How many people live in Fairfield County, OH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 167,800 people living in Fairfield County, OH. That makes Fairfield County the 19th-most populous county in Ohio. It is home to 1.4% of people living in the state.
168K
population of Fairfield County, OH (2024)
1.4%
County share of the Ohio population (2024)
About 167,800 people lived in Fairfield County, OH in 2024.
Population estimates, 2000–2024
What are Fairfield County, OH’s age demographics?
About 28,900 Fairfield County residents are aged 65 and older in 2024. That represents 17.2% of its population. For comparison, the age group represents 19.1% of Ohio’s population and 18% in the US overall.
Another 39,500 Fairfield County residents, or 23.6% of the population, were children under 18. For comparison, the age group represents 21.7% of Ohio’s population and 21.6% in the US overall.
A higher share of Fairfield County, OH's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Fairfield County, OH’s racial and ethnic demographics?
Non-Hispanic white residents make up 79.4% of the Fairfield County, OH population, higher than the national share of 57.5%. Fairfield County, OH also has a larger share of people identifying as non-Hispanic two or more races (2.6%) than the US overall (2.5%).
In contrast, Fairfield County’s Hispanic population accounts for 2.9%, below the 20% nationwide, and the non-Hispanic Asian population makes up 3.8% of the county, compared with 6.5% 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.
Fairfield County, OH has a higher share of a non-Hispanic white population than Ohio as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Fairfield County, OH is Lancaster with about 41,700 residents in 2024.
Cities and towns in Fairfield County, OH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Lancaster (pt.) | 41,660 |
| 2. | Pickerington (pt.) | 25,739 |
| 3. | Columbus (pt.) | 11,527 |
| 4. | Baltimore (pt.) | 3,084 |
| 5. | Lithopolis (pt.) | 2,796 |
| 6. | Madison | 1,784 |
| 7. | Bremen | 1,520 |
| 8. | Canal Winchester (pt.) | 1,251 |
| 9. | Reynoldsburg (pt.) | 1,202 |
| 10. | Millersport | 993 |
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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.
