How many people live in Olmsted County, MN?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 166,400 people living in Olmsted County, MN. That makes Olmsted County the seventh-most populous county in Minnesota. It is home to 2.9% of people living in the state.
166K
population of Olmsted County, MN (2024)
2.9%
County share of the Minnesota population (2024)
About 166,400 people lived in Olmsted County, MN in 2024.
Population estimates, 2000–2024
What are Olmsted County, MN’s age demographics?
About 29,500 Olmsted County, MN residents are aged 65 and older in 2024. That represents 17.7% of its population. For comparison, the age group represents 18.3% of Minnesota’s population and 18% in the US overall.
Another 38,800 Olmsted County residents, or 23.3% of the population, were children under 18. For comparison, the age group represents 22.4% of Minnesota’s population and 21.6% in the US overall.
A lower share of Olmsted County, MN's population is aged 45–64 than the US as a whole.
Population estimates by age group, (2024)
What are Olmsted County, MN’s racial and ethnic demographics?
Non-Hispanic white residents make up 75.4% of the Olmsted County, MN population, higher than the national share of 57.5%. Olmsted County, MN also has a larger share of people identifying as non-Hispanic Asian (7%) than the US overall (6.5%).
In contrast, Olmsted County’s Hispanic population accounts for 6.3%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 8.3% 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.
Olmsted County, MN has a higher share of a non-Hispanic Asian population than Minnesota as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Olmsted County, MN is Rochester with about 123,600 residents in 2024.
Cities and towns in Olmsted County, MN ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Rochester | 123,624 |
| 2. | Stewartville | 6,919 |
| 3. | Byron | 6,809 |
| 4. | Marion | 4,166 |
| 5. | Cascade | 2,835 |
| 6. | Oronoco | 2,537 |
| 7. | Rochester | 2,234 |
| 8. | Oronoco | 2,040 |
| 9. | Eyota | 2,025 |
| 10. | Haverhill | 1,482 |
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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.
