How many people live in Union County, NM?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 3,900 people living in Union County, NM. That makes Union County the 30th-most populous county in New Mexico. It is home to 0.18% of people living in the state.
3.93K
population of Union County, NM (2024)
0.18%
County share of the New Mexico population (2024)
About 3,900 people lived in Union County, NM in 2024.
Population estimates, 2000–2024
What are Union County, NM’s age demographics?
About 954 Union County, NM residents are aged 65 and older in 2024. That represents 24.3% of its population. For comparison, the age group represents 20.3% of New Mexico’s population and 18% in the US overall.
Another 805 Union County residents, or 20.5% of the population, were children under 18. For comparison, the age group represents 21.2% of New Mexico’s population and 21.6% in the US overall.
A higher share of Union County, NM's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Union County, NM’s racial and ethnic demographics?
Hispanic residents make up 41.6% of the Union County, NM population, higher than the national share of 20%. Union County, NM also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (1.8%) than the US overall (0.72%).
In contrast, Union County’s non-Hispanic Black or African American population accounts for 2.2%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 0.69% 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.
Union County, NM has a higher share of a non-Hispanic white population than New Mexico as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Union County, NM is Clayton with about 2,600 residents in 2024.
Cities and towns in Union County, NM ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Clayton | 2,559 |
| 2. | Des Moines | 111 |
| 3. | Folsom | 45 |
| 4. | Grenville | 24 |
| 5. | Balance of Union County | 1,187 |
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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.
