|Total||56.6 sq mi (146.5 km2)|
|Land||56.6 sq mi (146.5 km2)|
|Water||0.0 sq mi (0.0 km2)|
|Elevation||2,054 ft (626 m)|
|Density||17.8/sq mi (6.9/km2)|
|Time zone||Central (CST) (UTC-6)|
|Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1374000|
Harper is a census-designated place (CDP), located 23 miles (37 km) west of Fredericksburg on U.S. Highway 290, in Gillespie County, in the U.S. state of Texas. The population was 1,192 at the 2010 census.
According to the United States Census Bureau, the CDP has a total area of 56.6 square miles (147 km2), all of it land.
While the signers were overwhelmingly German immigrants, names also on the petition were Castillo, Pena, Munos, and a handful of non-German Anglo names.
The first white settlers were the families of Eli McDonald and Matthew Taylor in 1863. A historical marker just south of U.S. Highway 290 commemorates the McDonald massacre of August 1864. This incident involved the killing of two family members and the kidnapping of five more by Kiowa Indians.
A post office was established in 1883 by George Franklin Harper, for whom the town was named. By 1985, the town served a large ranching area and had six churches, fire department and ambulance services, a public school, and growing residential subdivisions. The population of the area exceeded 1,000 by 2000.
As of the census of 2000, there were 1,006 people, 417 households, and 293 families residing in the CDP. The population density was 17.8 people per square mile (6.9/km2). There were 536 housing units at an average density of 9.5/sq mi (3.7/km2). The racial makeup of the CDP was 95.73% White, 0.10% African American, 0.80% Native American, 0.10% Asian, 2.39% from other races, and 0.89% from two or more races. Hispanic or Latino of any race were 4.97% of the population.
There were 417 households out of which 30.5% had children under the age of 18 living with them, 62.4% were married couples living together, 6.2% had a female householder with no husband present, and 29.5% were non-families. 27.1% of all households were made up of individuals and 13.4% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.93.
In the CDP the population was spread out with 25.0% under the age of 18, 4.8% from 18 to 24, 24.6% from 25 to 44, 27.5% from 45 to 64, and 18.2% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 93.5 males. For every 100 females age 18 and over, there were 93.1 males.
The median income for a household in the CDP was $31,776, and the median income for a family was $39,013. Males had a median income of $26,900 versus $23,421 for females. The per capita income for the CDP was $15,318. About 10.8% of families and 17.3% of the population were below the poverty line, including 22.5% of those under age 18 and 10.7% of those age 65 or over.
Harper is served by the Harper Independent School District.