Jourdanton is located near the center of Atascosa County approximately 37 miles (60 km) south of downtown San Antonio.

Highway 16 leads north to San Antonio and south 165 miles (266 km) to Zapata near the Mexican border.

According to the United States Census Bureau, Jourdanton has a total area of 3.5 square miles (9.1 km2), all land.

[6] As of the 2020 United States census, there were 4,094 people, 1,431 households, and 1,039 families residing in the city.

The 1,353 housing units had an average density of 388.3 per square mile (149.9/km2).

The climate in this area is characterized by hot, humid summers and generally mild to cool winters.