California State Prison, Solano (CSP-SOL) is a CDCR men's institution in Vacaville. It's made up of 4 semi-autonomous facilities, a 125-bed Administrative Segregation Unit, and a 16-bed Correctional Treatment Center, and it runs a wide work and training program through the Prison Industry Authority. CSP-Solano opened in 1984 next to the California Medical Facility, sharing a warden with CMF until it became its own institution in January 1992. This guide covers CDCR's statewide inmate locator, CSP-Solano's visiting process, sending money, free phone calls, and mail rules. All data is verified from cdcr.ca.gov.
City
Vacaville
County
Solano County
State
CA
Facility Type
state prison
Gender
Male
Capacity
Not published by CDCR as a fixed number; check the current Weekly Population Report
Custody Levels
Not published as a single figure; CSP-Solano is made up of 4 semi-autonomous facilities plus a 125-bed Administrative Segregation Unit
Operator
California Department of Corrections and Rehabilitation (CDCR)
Address
2100 Peabody Road, Vacaville, CA 95687
Phone
(707) 451-0182
Inmate Locator
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CDCR runs one statewide inmate search tool, not a separate tool per prison. Here's how to confirm someone is at CSP-Solano.
View ArticleYou need CDCR Form 106 approval first, then you book your visit through the statewide VSA system, plus a numbered walk-in pass process.
View ArticleCDCR's statewide money process, covering EFT vendors and mailed checks or money orders.
View ArticleAll outgoing calls from CSP-Solano are free. Here's what we do and don't know about the tablet and messaging provider.
View ArticleCSP-Solano uses one general P.O. Box for personal mail, simpler than facilities that split mail by housing unit.
View ArticleCDCR runs one statewide inmate search tool, CIRIS, not a separate tool per facility. Search by name or CDCR number, then confirm the result lists California State Prison, Solano.
See the full breakdownYou need CDCR Form 106 signed by the incarcerated person and mailed in for approval before you can schedule anything. Once approved, book through the statewide VSA system, or use the numbered walk-in pass system if you don't have an appointment.
See the full breakdownCDCR uses one statewide money process: EFT through GTL/ConnectNetwork, JPay, or Access Corrections, or a check or money order payable to CDCR. See the full CDCR send-money guide.
See the full breakdownAll outgoing voice calls are free statewide, limited to 15 minutes. We could not confirm which tablet and messaging provider CSP-Solano currently uses, so confirm with the institution directly.
See the full breakdownCSP-Solano publishes one general P.O. Box, 4000, for personal mail, unlike some CDCR prisons that split mail by housing unit.
See the full breakdown6 of 9 questions
Use CIRIS, the California Incarcerated Records and Information Search, at ciris.mt.cdcr.ca.gov. Search by name or CDCR number, then confirm the result lists California State Prison, Solano.
Inmate SearchFriday 12:00pm to 6:30pm, and Saturday and Sunday 8:00am to 2:30pm. Visitor processing generally ends about 1 hour before visiting closes, based on the facility's operations manual, so call (707) 451-0182 to confirm the exact cutoff before you travel.
VisitationYes. CDCR Form 106, the Visitor Questionnaire, must be signed by the incarcerated person and mailed in for a background check before you can be approved to visit. We didn't find a CSP-Solano-specific handbook or a separate visitor form beyond this standard CDCR process.
VisitationNo. CSP-Solano opened in 1984 and was originally administered under the warden of the neighboring California Medical Facility (CMF). CSP-Solano got its own warden in January 1992 and has operated as a fully separate institution since then. CMF is a different, already-built facility in our guides.
AboutP.O. Box 4000, Vacaville, CA 95696-4000, for personal letters, cards, and photos. CDCR's official facility page doesn't break mail down by housing unit here, so this one address covers general population mail.
MailCDCR uses one statewide money process. Send electronically through GTL/ConnectNetwork, JPay, or Access Corrections. See the full CDCR send-money guide for details.
Send MoneyAll outgoing voice calls are free statewide, limited to 15 minutes. We couldn't confirm which company currently runs CSP-Solano's tablet and messaging system. Call (707) 451-0182 to ask before you set up an account.
Phone CallsYes. CSP-Solano runs a Friends Outside Visitor Center called the Friendship House, mandated under Penal Code 6352, which offers a sheltered waiting area, a clothing exchange for visiting attire, childcare during visits, and help getting between public transit and the institution. It also offers Family Liaison Services under Assembly Bill 2848, plus Parenting Inside Out, a 60-hour parenting curriculum that started at CSP-Solano in March 2014.
VisitationCalifornia State Prison, Solano (CSP-SOL) is a CDCR men's institution in Vacaville, made up of 4 semi-autonomous facilities, a 125-bed Administrative Segregation Unit, and a 16-bed Correctional Treatment Center. It runs a large work and training program, including Prison Industry Authority operations in book bindery, laundry, metal fabrication, and optical work, along with numerous self-help groups and religious programs. CSP-Solano opened in 1984, originally under the warden of the adjacent California Medical Facility, and became a fully separate institution with its own warden in January 1992.
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All information on this page comes directly from official government and facility sources. How we verify information › Last verified July 20, 2026. Official source: cdcr.ca.gov/facility-locator/sol ›