How many people live in Buchanan County, MO?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 83,600 people living in Buchanan County, MO. That makes Buchanan County the 15th-most populous county in Missouri. It is home to 1.3% of people living in the state.
83.6K
population of Buchanan County, MO (2024)
1.3%
County share of the Missouri population (2024)
About 83,600 people lived in Buchanan County, MO in 2024.
Population estimates, 2000–2024
What are Buchanan County, MO’s age demographics?
About 15,300 Buchanan County, MO residents are aged 65 and older in 2024. That represents 18.3% of its population. For comparison, the age group represents 18.8% of Missouri’s population and 18% in the US overall.
Another 18,500 Buchanan County residents, or 22.1% of the population, were children under 18. For comparison, the age group represents 22% of Missouri’s population and 21.6% in the US overall.
A lower share of Buchanan County, MO's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Buchanan County, MO’s racial and ethnic demographics?
Non-Hispanic white residents make up 79.8% of the Buchanan County, MO population, higher than the national share of 57.5%. Buchanan County, MO also has a larger share of people identifying as non-Hispanic two or more races (3%) than the US overall (2.5%).
In contrast, Buchanan County’s Hispanic population accounts for 8.7%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 5.8% 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.
Buchanan County, MO has a higher share of a Hispanic population than Missouri as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Buchanan County, MO is St. Joseph with about 71,100 residents in 2024.
Cities and towns in Buchanan County, MO ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | St. Joseph | 71,098 |
| 2. | Agency | 653 |
| 3. | De Kalb | 239 |
| 4. | Easton | 226 |
| 5. | Rushville | 218 |
| 6. | Lewis and Clark Village | 92 |
| 7. | Gower (pt.) | 30 |
| 8. | Dearborn (pt.) | |
| 9. | Balance of Buchanan County | 11,018 |
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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.
