Main Adult Detention Facility Inmate Search

Main Adult Detention Facility Overview

Main Adult Detention Facility, commonly shortened to MADF, is operated by the Sonoma County Sheriff's Office Detention Division at 2777 Ventura Avenue in Santa Rosa. Sheriff-Coroner Eddie Engram leads the sheriff's office, and the official facility page identifies MADF as part of the County of Sonoma Hall of Justice Complex. For readers trying to locate a newly arrested person, that matters because MADF is the primary county jail and the facility most closely tied to booking, classification, court movement, lobby contact, and the public jail roster.

The sheriff describes MADF as a medium/maximum-security county jail holding both pre-trial and sentenced adults. It opened in 1991 as a direct-supervision, new-generation jail, a change from older linear jail designs. Direct supervision means custody deputies work in closer contact with incarcerated people and rely on communication, leadership, and active housing-unit management instead of only remote observation. The original building was designed for close to 500 inmates, reached pressure quickly, and received a 1997 expansion that added 290 beds.

The official Sonoma Sheriff facilities page shows MADF and NCDF together and is the best visual source for how the two local detention buildings fit into the sheriff's system.

That facilities source is also where the sheriff reports MADF's opening, expansion, direct-supervision design, and 2018 total capacity figure.

Main Adult Detention Facility Capacity and Population

The facility-specific capacity number in the research is an official sheriff statement, not a live jail count. The sheriff reported that MADF had a total capacity of 1,473 inmates in 2018. Sonoma County's broader jail population is tracked by the California Board of State and Community Corrections through Jail Profile Survey data, but the current interactive BSCC figure was not extracted into the research file. For that reason, the number below is labeled as a 2018 sheriff capacity statement rather than a current head count.

BSCC historical Sonoma jail average daily population figures showed 1,079 in 2014, 1,076 in 2015, 1,044 in 2016, 1,029 in 2017, and 1,035 for the first three quarters of 2018. Those are county jail system figures, not a verified day-by-day MADF-only count. They are useful for understanding scale, but not for deciding whether a specific person is in custody today.

How to Look Up an Inmate at Main Adult Detention Facility

Use the Sonoma Sheriff incarcerated person search gateway first, then follow the "I agree" link to the official Sonoma County Jail Inmate Search. The sheriff's research language says the public search covers people arrested and booked into Sonoma County Jail who are in custody at the time of the search. It is not a complete historical arrest database, and it is not the right system for a person already transferred to CDCR, BOP, or ICE custody.

1. Open the sheriff gateway and continue to the official jail inmate search.
2. Search by last name if the booking number is unknown. The public form also has a Spanish label toggle.
3. Search by booking number when one is available from the roster, a phone call, mail preparation, or records paperwork.
4. Review the visible result fields: name, age, arresting agency, and booking number.
5. If there is no result, call detention at (707) 565-1400, use sheriff records for releasable documents, check the Sonoma Superior Court portal for filed charges, or use CDCR, BOP, ICE, and VINELink for other custody stages.

The official jail search form is shown in the captured roster screenshot below.

The booking number is especially practical for MADF because it helps narrow common names and is required for Sonoma County detention mail.

Main Adult Detention Facility Address and Contact

MADF is in the county government complex area just east of U.S. 101. Detention access, visitation scheduling, and general jail questions route through the public detention number. Sheriff records requests for releasable reports and documents are handled separately by the sheriff records contact at headquarters, but custody confirmation and visit scheduling should begin with detention.

Directions and Parking for MADF

The sheriff's directions to detention facilities page says MADF is conveniently situated just off U.S. 101 in Santa Rosa. From northbound U.S. 101, use exit 491B for Bicentennial Way East/Sonoma County Administration Center, merge onto Bicentennial Way, then turn right onto Ventura Avenue. The facility is on the right just past the apartments.

From southbound U.S. 101, the official route is more detailed: take exit 492 for Hopper Avenue, turn left on Hopper, continue to Cleveland Avenue, turn right on Piner Road, left on Range Avenue, left on Bicentennial Way, and right on Ventura Avenue at the stoplight. Visitor parking is available around the county complex, but the sheriff notes that some lots are permit-only and that construction has limited availability. Confirm parking before traveling when a visit appointment, court movement, or lobby deadline is time-sensitive.

The official directions page includes the current county-complex parking notes and is the source to check before driving to Ventura Avenue.

Those parking caveats are MADF-specific because NCDF has a simpler front visitor lot and no permit requirement in the sheriff's directions.

Visiting Someone at Main Adult Detention Facility

Personal visitation at MADF requires an appointment by telephone. Call (707) 565-1400 Tuesday through Friday from 3:00 pm to 9:00 pm. Same-day signups are not allowed. Visits occur Saturday, Sunday, and Monday, last 30 minutes, and allow a maximum of two visitors. The incarcerated person may receive one visit per visitation day. Visitors must check in with the lobby 20 minutes before the scheduled visit.

Visitors recently released from custody must wait 30 days before returning to visit unless visiting a spouse. Convicted felons need prior written approval from the Facility Manager or designee. Missed appointments can affect visiting privileges, and the sheriff asks for 24-hour cancellation notice.

Mail, Phone, and Money at Main Adult Detention Facility

Sonoma County's mail rules changed in 2025. Beginning September 1, 2025, non-privileged mail must go through Pigeonly, and after October 1, 2025 non-privileged mail received at the facility is returned to sender. Legal mail, official documents, and publications sent directly from a publisher or distributor continue going directly to the named incarcerated person at MADF or NCDF. Every mail item must include the incarcerated person's booking number and a return address.

The sheriff's depositing money to account page separates general commissary funds from communication funds.

Use the right account type before depositing, because phone, tablet, text, and commissary balances are not the same thing.

Booking, Classification, and Court Movement at MADF

MADF is tied to several detention functions that affect what families see in the roster. Detention Specialists work in lobby, cashier booth, records, mail, booking, classification, and detention alternatives. The research says they enter custody data, receive court minutes, and process bonds, citations, and releases. A same-day arrest may therefore take time to appear online while booking, classification, and data entry are completed.

Classification Deputies review charges, past in-custody behavior, gang affiliation, and other information before assigning housing. Court Holding/Movement Deputies move inmates to and from court holding cells and supervise people staged for court. For serious behavior or mental-health needs, the Detention Division has specialized housing and trained deputies, including a maximum-security male special module and mental-health core deputies using internal behavior codes.

About Main Adult Detention Facility

MADF is the main public-facing Sonoma County jail, but it is part of a larger detention system that also includes NCDF, detention alternatives, medical and mental-health services, programs, and facility inspections. The sheriff lists programs such as Alcohol/Narcotics Anonymous, Five Keys, GED/general education, parenting, anger management, religious services, job skills, life skills, reentry, PATHS, Starting Point, service dog training, and correspondence or independent study. The education program includes graduation ceremonies and diplomas for people who complete general education requirements.

For records purposes, keep the custody stage straight. MADF and NCDF are county jail facilities. Filed criminal charges belong in Sonoma Superior Court records. A person sentenced to California state prison should be searched in CDCR CIRIS. Federal sentenced custody uses the BOP locator, immigration detention uses ICE ODLS, and VINELink is best treated as a custody-status and notification tool rather than a replacement for the sheriff roster.