The area now occupied by Glenunga International High School and Webb Oval were previously home to slaughterhouses established in 1882.

A number of coach companies, notably those of William Rounsevell, Cobb & Co and John Hill, were set up in the 1870s and 1880s.

[citation needed] Due to the small size of the suburb, there is only one main park, Glenunga Reserve, which also contains Webb Oval.

The school campus is an easily identifiable part of Glenunga, being situated roughly in the middle of the suburb.

The school's expansion and development have aided in the once-quiet L'Estrange Street being clogged with both traffic and students at peak hour and other times.

[citation needed] A number of businesses and shops are located along Glen Osmond Road and Conyngham Street.

[5] Glenunga is in the South Australian House of Assembly Electoral District of Bragg and the Federal Division of Sturt, and is a solid Liberal-voting area.