San Juan is a census-designated place (CDP) in Starr County, Texas, United States. It is a new CDP formed from part of the Garceno CDP prior to the 2010 census, with a population of 129.
San Juan is located at (26.414966, -98.943691).
San Juan first appeared in the 2010 U.S. census after being carved out from part of the Garceno CDP.
The CDP is within the Roma Independent School District. The zoned elementary school is R. T. Barrera Elementary School. Roma High School is the district's sole comprehensive high school.