Flor del Rio is a census-designated place (CDP) in Starr County, Texas, United States. It is a new CDP, formed from part of the Los Alvarez CDP prior to the 2010 census. As of the 2020 census, Flor del Rio had a population of 101.
Flor del Rio is located at (26.401302, -98.901498).
Flor del Rio first appeared as a census designated place in the 2010 U.S. census after being carved out along with 3 other CDPs (Barrera, El Quiote, and Palo Blanco) from the Los Alvarez CDP.
The CDP is within the Roma Independent School District. The zoned elementary school is Delia Gonzalez (DG) Garcia Elementary School. Roma High School is the district's sole comprehensive high school.