[5] Keene sits on a regional watershed divide, with the northern and eastern sides of the city draining to Turkey Creek, part of the Trinity River watershed, and the southern and western sides draining to East Buffalo Creek, part of the Brazos River watershed.

As of the 2020 United States census, there were 6,387 people, 1,972 households, and 1,470 families residing in the city.

Male full-time workers had a median income of $45,345 versus $34,338 for females.

[12] The Keene Independent School District provides public education to the area.

Both schools, along with Southwestern Adventist University (a private liberal arts university in Keene which is currently the only four-year institution of higher learning in Johnson County), are affiliated with the Seventh-day Adventist Church.

Elisa Carver Park is located in the heart of Keene and includes softball, soccer and tee ball fields, volleyball and basketball courts, walking trail, playground, picnic area, and nine-hole disc golf course.