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Alabama
    Holman Correctional Facility - Atmore, Alabama
Arizona
    ASPC-Eyman, SMU I - Florence, Arizona
    ASPC-Eyman, Browning Unit (Previously SMU II) - Florence, Arizona
    United States Penitentiary - Tucson, Arizona
Arkansas
    Varner Supermax - Lincoln County, Arkansas
California
    United States Penitentiary - Atwater, California
    Pelican Bay State Prison - Crescent City, California
    Alcatraz Federal Penitentiary - San Francisco, California (Closed March 21, 1963)
    California Correctional Institution, Tehachapi, California
    High Desert State Prison - Susanville, California
Colorado
    Colorado State Penitentiary - Cañon City, Colorado
    U.S. Penitentiary Florence ADMAX (Administrative Maximum) Facility - Florence, Colorado (entirely supermax)
Connecticut
    Northern Correctional Institution - Somers, Connecticut
Florida
    United States Penitentiary - Coleman, Florida
    Florida State Prison - Raiford, Florida
Georgia
    United States Penitentiary - Atlanta, Georgia
Idaho
    Idaho Maximum Security Institution - Boise, Idaho
Illinois
    United States Penitentiary - Marion, Illinois (Downgraded to a medium-security facility in September 2006)[22]
    Tamms Correctional Center - Tamms, Illinois (Closed January 2013)
Indiana
    Wabash Valley Correctional Facility, SHU - Carlisle, Indiana
    United States Penitentiary - Terre Haute, Indiana
    Westville Correctional Facility, WCU - Westville, Indiana
Kansas
    United States Disciplinary Barracks - Fort Leavenworth, Kansas (military prison)
    United States Penitentiary - Leavenworth, Kansas (being downgraded to medium security)
    El Dorado Correctional Facility - El Dorado, Kansas
Kentucky
    Kentucky State Penitentiary - Eddyville, Kentucky (the only prison in Kentucky housing supermax units)
Louisiana
    Louisiana State Penitentiary - West Feliciana Parish, Louisiana
    United States Penitentiary Pollock
Maine
    Maine State Prison - Warren, Maine (contains only 1 supermax unit)
Maryland
    Maryland Correctional Adjustment Center - Baltimore, Maryland
    North Branch Correctional Institution - Cumberland, Maryland (final housing unit began operation in summer of 2008)
Massachusetts
    Souza-Baranowski Correctional Center- Lancaster, Massachusetts
    Massachusetts Correctional Institution - Cedar Junction - Walpole, Massachusetts
Minnesota
    Minnesota Correctional Facility Oak Park Heights - Oak Park Heights, Minnesota
Mississippi
    Mississippi State Penitentiary - Sunflower County, Mississippi (Unit 32)[23]
Missouri
    Jefferson City Correctional Center - Jefferson City, Missouri
New Hampshire
    New Hampshire State Prison - Men - Concord, New Hampshire
New Jersey
    New Jersey State Prison - Trenton, New Jersey
    East Jersey State Prison - Woodbridge, New Jersey
    Northern State Prison - Newark, New Jersey
    Essex County Correctional Facility - Newark, New Jersey
New Mexico
    Penitentiary of New Mexico - unincorporated Santa Fe County, New Mexico - Uses the Bureau Classification System - Level 6 being Supermax
New York
    Attica Correctional Facility - Attica, New York
    Upstate Correctional Facility - Malone, New York
    Sing Sing Correctional Facility - Ossining, New York
    Southport Correctional Facility - (disciplinary supermax prison with only solitary confinement), Pine City, New York
Ohio
    Ohio State Penitentiary - Youngstown, Ohio
Oklahoma
    Oklahoma State Penitentiary - McAlester, Oklahoma
Oregon
    Oregon State Penitentiary - Salem, Oregon
Pennsylvania
    United States Penitentiary - Allenwood, Pennsylvania
    United States Penitentiary - Lewisburg, Pennsylvania
    State Correctional Institution Greene - Waynesburg, Pennsylvania
South Carolina
    Kirkland Maximum Security Institution - Columbia, South Carolina
Tennessee
    Riverbend Maximum Security Institution - Nashville, Tennessee
Texas
    United States Penitentiary - Jefferson County, Texas[citation needed]
    Estelle High Security Unit - W.J. Estelle Unit - Walker County, Texas[24]
    Allan B. Polunsky Unit (formerly Terrell Unit) - West Livingston, Texas[25]
Utah
    Utah State Prison - Draper, Utah
Virginia
    Wallens Ridge State Prison - Big Stone Gap, Virginia
    Red Onion State Prison - Wise County, Virginia
Washington
    Washington State Penitentiary
West Virginia
    Mt. Olive Correctional Complex - Fayette County, West Virginia
Wisconsin
    Wisconsin Secure Program Facility - Boscobel, Wisconsin