Not Entirely A Real Jail
The interior of Shawshank Prison is extremely impressive, but it is not a real prison. The exterior scenes of the institution were shot at the decommissioned Ohio State Reformatory in Mansfield, but the interior was too damaged to save. As a result, many of the interior sequences were shot on a sound stage since the producers reasoned that it would be less expensive to build one than to try to rehabilitate the interiors of the aging prison. We were definitely duped!

Not Entirely A Real Jail