Anthony Pena was released from jail at 2:20 a.m. when he pretended to be another inmate, FOX10 Phoenix reported, citing the Maricopa County Sheriff's Office.
Officers realized at around 9:30 a.m. that Pena had been mistakenly released, according to AZFamily.
The sheriff's office said it was working with the courts to issue a warrant for Pena's arrest.
Phoenix police had earlier booked Pena into jail on drug charges and for failing to appear in court. His bond had been set at $250, the outlets reported.
No further details were immediately available.