She was reported missing from her home at 608 SE A Street just before 6:45.
The child's body was found as police combed the neighborhood while investigating her disappearance.
According to a news release, the case has now turned into a homicide investigation.
Police tell KARK sister station KNWA in Fayetteville that all available personnel are on hand in this investigation. They say there are "several residents of interest" who are being investigated in the neighborhood.
The Benton County deputy prosecutor is working with detectives and law enforcement on the scene. Along with the home the child went missing from, at least three other neighboring homes are blocked with police tape.
Police confirm the 6-year-old was a student in the Bentonville School District.
No further details are being released.