The data shows one man was released in the West Salem zip code.
Greg Leigh, 59, whose IDOC number is S16554, was paroled on May 11.
In total, the state corrections department released 1,856 men and women on mandatory supervised release in May, according to records.
Under state law, paroled offenders are still in legal custody of the IDOC, meaning they can be taken back to a correctional center at any time if the state has probable cause or a warrant.
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