|• Total||2.8 sq mi (7.3 km2)|
|• Land||2.8 sq mi (7.3 km2)|
|• Water||0.01 sq mi (0.02 km2)|
|Elevation||892 ft (272 m)|
|• Density||2,180.7/sq mi (836.4/km2)|
|Time zone||Central (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1338981|
As of the census of 2000, there were 5,003 people, 1,651 households, and 1,147 families residing in the city. The population density was 1,783.2 people per square mile (687.4/km²). There were 1,772 housing units at an average density of 631.6/sq mi (243.5/km²). The racial makeup of the city was 74.46% White, 7.06% African American, 0.76% Native American, 2.44% Asian, 2.60% Pacific Islander, 9.33% from other races, and 3.36% from two or more races. Hispanic or Latino of any race were 25.84% of the population.
There were 1,651 households out of which 35.9% had children under the age of 18 living with them, 52.8% were married couples living together, 12.5% had a female householder with no husband present, and 30.5% were non-families. 22.5% of all households were made up of individuals and 10.4% had someone living alone who was 65 years of age or older. The average household size was 2.78 and the average family size was 3.29.
In the city the population was spread out with 26.2% under the age of 18, 19.0% from 18 to 24, 26.8% from 25 to 44, 15.3% from 45 to 64, and 12.6% who were 65 years of age or older. The median age was 28 years. For every 100 females there were 89.1 males. For every 100 females age 18 and over, there were 83.7 males.
The median income for a household in the city was $34,676, and the median income for a family was $42,269. Males had a median income of $27,625 versus $23,977 for females. The per capita income for the city was $14,809. About 6.0% of families and 10.0% of the population were below the poverty line, including 3.2% of those under age 18 and 17.8% of those age 65 or over.
In addition to the Dallas-Fort Worth media, news related to the city of Keene is covered by the Keene Star  and Cleburne Times-Review. The latter newspaper covers Johnson and Somervell counties. Radio stations KHFX, which has a country music format, and KJRN, the listener-supported, Christian radio station of Southwestern Adventist University
Southwestern Adventist University, a private liberal arts university in Keene is currently the only four-year institution of higher learning in Johnson County. It is affiliated with the Seventh-day Adventist Church. Keene has its own independent school district, KISD, which includes Keene Elementary School, Keene Intermediate School, Keene Junior High School, Alternative Learning Center (Grades 6-12), and Wanda R. Smith High School. There are two private K-12 schools in the city, Keene Adventist Elementary School and Chisholm Trail Academy.
The Elisa Carver Park is located in the heart of Keene and includes softball, soccer and tee ball fields, volleyball and basketball courts, a three-quarters-of-a-mile walking trail, playground, and a picnic area, as well as a nine hole disc golf course.
- "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.
- 88.3 KJCR Online "Your Daily Inspiration"
There is also the Rex E Callicott Student Park which is owned by Southwestern Adventist University. The park is affectionately referred to as the "Duck Pond" by locals due to ducks that inhabit the pond that the park is built around. There is a baseball field, soccer field, tennis courts, old non-functioning grass runway airport, open fields, and of course the pond.