Santa Teresa is an unincorporated community in Doña Ana County, New Mexico, United States. It is home to the Santa Teresa Port of Entry and is part of the Las Cruces Metropolitan Statistical Area, although geographically it is considerably closer to El Paso, Texas than to Las Cruces. For statistical purposes, the United States Census Bureau has defined Santa Teresa as a census-designated place (CDP). The census definition of the area may not precisely correspond to local understanding of the area with the same name. The population was 4,258 at the 2010 census.
Residents filed a petition in 2015 seeking the incorporation of Santa Teresa as a city. The case has been appealed to the New Mexico Supreme Court by Sunland Park as they have proposed annexing the community.
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.