Location of Tehuacana, Texas
|• Total||1.6 sq mi (4.2 km2)|
|• Land||1.6 sq mi (4.2 km2)|
|• Water||0.0 sq mi (0.0 km2)|
|Elevation||640 ft (195 m)|
|• Density||190.3/sq mi (73.5/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1376406|
A post office called Tewockony Springs was established in what is now known as Tehuacana in 1847. It was named for the Tawakoni Indians, who lived in the area until the late 1840s. When Tehuacana Academy opened in 1852, the community was known as Tehuacana Hills, though the post office continued to be called after the springs. The post office was discontinued during the Civil War, but service resumed in 1869, at which time the name of the office was changed to Tehuacana. 
Tehuacana is located at (31.742338, -96.545560).
According to the United States Census Bureau, the town has a total area of 1.6 square miles (4.1 km2), all of it land.
As of the census of 2000, there were 307 people, 132 households, and 86 families residing in the town. The population density was 190.3 people per square mile (73.6/km²). There were 147 housing units at an average density of 91.1 per square mile (35.3/km²). The racial makeup of the town was 89.25% White, 7.49% African American, 2.93% from other races, and 0.33% from two or more races. Hispanic or Latino of any race were 2.93% of the population.
There were 132 households out of which 30.3% had children under the age of 18 living with them, 54.5% were married couples living together, 8.3% had a female householder with no husband present, and 34.1% were non-families. 33.3% of all households were made up of individuals and 18.2% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.89.
In the town the population was spread out with 23.5% under the age of 18, 10.7% from 18 to 24, 23.5% from 25 to 44, 27.0% from 45 to 64, and 15.3% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 100.7 males. For every 100 females age 18 and over, there were 92.6 males.
The median income for a household in the town was $35,469, and the median income for a family was $51,250. Males had a median income of $31,250 versus $21,786 for females. The per capita income for the town was $18,965. About 8.5% of families and 10.6% of the population were below the poverty line, including 9.1% of those under the age of eighteen and none of those sixty five or over.
The town of Tehuacana is served by the Mexia Independent School District.
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- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.