Santa Teresa is a census-designated place (CDP) in Doña Ana County, New Mexico, United States. The population was 4,258 at the 2010 census. It is part of the Las Cruces Metropolitan Statistical Area, although geographically it is considerably closer to El Paso, Texas than to Las Cruces. It is home to the Santa Teresa Port of Entry.
Santa Teresa is located at 31°51′12″N 106°38′29″W (31.853273, -106.641302). According to the United States Census Bureau, the CDP has a total area of 10.9 square miles (28 km2), all of it land.
As of the census of 2000, there were 2,607 people, 952 households, and 755 families residing in the CDP. The population density was 238.0 people per square mile (91.9/km²). There were 1,007 housing units at an average density of 91.9 per square mile (35.5/km²). The racial makeup of the CDP was 82.09% White, 1.19% African American, 0.65% Native American, 0.38% Asian, 0.23% Pacific Islander, 13.04% from other races, and 2.42% from two or more races. Hispanic or Latino of any race were 55.58% of the population.