Rio Hondo is a city in Cameron County, Texas, United States.

Rio Hondo is located in north-central Cameron County at 26°14′4″N 97°34′53″W / 26.23444°N 97.58139°W / 26.23444; -97.58139 (26.234451, –97.581364).

As of the 2020 United States census, there were 2,021 people, 847 households, and 626 families residing in the city.

As of the census[2] of 2000, there were 1,942 people, 588 households, and 476 families residing in the city.

17.5% of all households were made up of individuals, and 9.7% had someone living alone who was 65 years of age or older.

The United States Postal Service operates the Rio Hondo Post Office.