State prisons are facilities designed to house people who have been convicted of breaking state laws...
Locate the state, then the city or county where you think they are being held.
State prisons are facilities designed to house people who have been convicted of breaking state laws and who have been ordered to serve from-one-year-to-life incarcerated.
Those convicted in a state court and given the death penalty are also held in state prisons.
To find someone you know who is incarcerated in the feds, or to find a particular federal prison, begin your search here: