COUNTY · NM
Union County, New Mexico
Union County is a county in New Mexico with FIPS code 35059 and an estimated population of 3,964 (Census 2023), 30th largest of 33 in the state.
County facts
- Name
- Union County
- State
- New Mexico
- Type
- county
- FIPS code
- 35059
- State FIPS
- 35
- Population (2023)
- 3,964
- Change since 2020
- -2.6%
- State rank
- 30 of 33
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Union County?
Union County, New Mexico has the five-digit FIPS code 35059: 35 for the state and 059 for the county.
What state is Union County in?
Union County is in New Mexico.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.