Cpl. Kay Lester of the Fulton County Police Department said the woman was found in a car at the Mallory Park subdivision off Flat Shoals Road at about 6 a.m.
Police have not released a cause of death, pending the medical examiner's report.
Authorities said there were no signs of trauma to the body.
The person was described as being in her late 20s or early 30s.
No name has been released.