Medulla is an unincorporated community and census-designated place (CDP) in western Polk County, Florida, United States.

[4] Before the post office opened, the community was called Spring Hill.

[5] The name Medulla was given to the area due to its connecting link on the stagecoach rail-line between Bartow and Fort Meade, similar to how the medulla oblongata (in the lower part of the brain) connects with spinal cord.

[6] Medulla saw a period of rapid growth throughout the 1990s and early 2000s with development of Deer Brooke, a mega deed restricted community.

23.9% of all households were made up of individuals, and 4.8% had someone living alone who was 65 years of age or older.