what neighborhood were the unidentified mississippi state penitentiary prisoners fro

The Mississippi State Penitentiary is in Parchman, an unincorporated area in Sunflower County, Mississippi, not a neighborhood. The prison’s official facility page says it is located at Parchman in Sunflower County.

If you meant the nearby community rather than the prison itself, the best- supported answer from available sources is still Parchman/Sunflower County rather than a city neighborhood.