Where can I find information (address, phone numbers, warden, etc.) for all the prisons/jails in the U.S. by state?
The information is more thorough for states that have individual webpages or summary pages for their prisons on-line. You will need to check each linked site for specific information beyond just facility name.
There is no easily accessible, no-cost, comprehensive list of prisons with actual addresses and phone numbers all in one site or document.
The American Correctional Association (ACA) has an annual directory of all the state DOCs ($100) which includes all prisons (as well as other correctional services) by state and very often the private prisons as well. If you contact the American Correctional Association, they can provide you a mailing list/contact list for prisons (for a fee). American Correctional Association (ACA) general number: (703) 224-0000
Department of Corrections Facilities by State