Key facts
- Country
- United States
- State
- New Mexico
- Seat
- Las Cruces
- Largest city
- Las Cruces
- Total
- 3,814 sq mi (9,880 km )
- Land
- 3,808 sq mi (9,860 km )
- Water
- 6.9 sq mi (18 km ) 0.2%
- Estimate 2025
- 229,091
- Density
- 57.66/sq mi (22.26/km )
- Time zone
- UTC−7 ( Mountain )
- Summer dst
- UTC−6 ( MDT )
- Congressional district
- 2nd
- Website
- donaanacounty .org
Article
Doña Ana County (Spanish: Condado de Doña Ana) is a county located in the southern part of the New Mexico, United States. As of the 2020 U.S. census, its population was 219,561, which makes it the second-most populated county in New Mexico. Its county seat is Las Cruces, which has a population of 111,385 as of the 2020 U.S. Census, making it the second-most populous municipality in New Mexico after Albuquerque.
The county is named for Doña Ana Robledo, who died there in 1680 while fleeing the Pueblo Revolt.