According to the United States Census Bureau, the city has a total area of 14.5 square miles (37.6 km²), of which, 14.4 square miles (37.3 km²) of it is land and 0.1 square miles (0.3 km²) of it (0.76%) is water.
There were 2,980 households out of which 45.4% had children under the age of 18 living with them, 60.7% were married couples living together, 9.5% had a female householder with no husband present, and 25.3% were non-families. 20.0% of all households were made up of individuals and 5.5% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.33.
In the city the population was spread out with 29.8% under the age of 18, 15.9% from 18 to 24, 33.3% from 25 to 44, 15.1% from 45 to 64, and 5.9% who were 65 years of age or older. The median age was 28 years. For every 100 females there were 119.7 males. For every 100 females age 18 and over, there were 126.6 males.
The median income for a household in the city was $37,789, and the median income for a family was $42,247. Males had a median income of $30,051 versus $20,847 for females. The per capita income for the city was $16,050. About 7.2% of families and 19.2% of the population were below the poverty line, including 12.9% of those under age 18 and 9.8% of those age 65 or over.
Ingleside is also noted for a stained glass window of "The Presentation of Jesus in the Temple", that was made in the 17th century in Spain and was donated by a man named Minor Culli of Corpus Chrtisti, Texas to be placed above the altar at Our Lady of the Assumption Catholic Parish. The window is considered "lost art" because it was stained on both sides. No one knows who put the window together. Minor and Minerva Culli were vacationing in Spain in 1972 and found the stained glass at an auction. It was taken out of a family chapel and put into storage for safe keeping in the 1600s. The Culli's had a hard time getting the art work out of Spain and shipped to the U.S. It was the last piece of art to be taken out of Spain.