Santa Teresa, NM has a population of 4,388 and is the 7,021st largest city in the United States. The population density is 436 per sq mi which is 2441% higher than the New Mexico average and 381% higher than the national average. The median age in Santa Teresa is 31 which is approximately 16% lower than the New Mexico average of 37. In Santa Teresa, 52% of the population over 15 years of age are married, 41% speak English and 59% speak Spanish. 6% of Santa Teresa residents were born in New Mexico, 78% were born out of state, 3% were born outside of the United States and 13% were foreign born.