Williamson County Inmate Search
How To Search for Inmate Records in Williamson County in 2026
WilliamsonCountyRecords.us provides access to publicly available data and information related to inmate records in Williamson County, Illinois. Members of the public may find records pertaining to current custody status, booking information, charges, bond amounts, and facility assignments. Available record categories include booking records, incarceration history, court dates, and release information. Access and completeness of records may vary depending on the custodial agency and the nature of the case.
Inmate records in Williamson County may be searched through official government resources, the county clerk's office, public access terminals at the courthouse, and online tools maintained by the Sheriff's Office and the Illinois Department of Corrections. The following methods outline the available channels for locating inmate information.
Online Search Methods
1. County Sheriff's Office Inmate Search
The Williamson County Sheriff's Office maintains a current inmate roster that members of the public may access to locate individuals held at the county jail.
To conduct a search, members of the public should:
- Navigate to the Williamson County Sheriff's Office official website
- Locate the inmate search or jail roster section
- Select a search type, such as by name, booking number, or booking date
- Enter the available search criteria into the designated fields
- Review the results list for matching individuals
- Select a specific record to view detailed information
The inmate roster at present displays the following information for each individual in custody:
- Full legal name and aliases
- Booking photograph
- Current charges and charge descriptions
- Bond type and bond amount
- Facility location and housing assignment
- Booking date
- Expected release date, where available
The roster is updated on a daily basis. Individuals booked within the past several hours may not yet appear in the online system. No mobile application is currently offered by the Williamson County Sheriff's Office for inmate searches.
Williamson County Sheriff's Office
407 N. Monroe Street, Suite 114
Marion, IL 62959
Phone: (618) 997-6541
Williamson County Sheriff's Office
2. State Department of Corrections Inmate Search (for state prison)
Individuals sentenced to terms of one year or more in Illinois are transferred from county jail to the custody of the Illinois Department of Corrections (IDOC). The Individual in Custody Search tool maintained by IDOC allows members of the public to locate individuals currently housed in state correctional facilities.
To search, users may enter the individual's first and last name or their IDOC identification number. The search returns information including the individual's current facility, projected release date, offense history, and physical description. The distinction between county jail and state prison is significant: county jail houses pre-trial detainees and individuals serving sentences of less than one year, while state prison houses individuals convicted of felonies with sentences exceeding one year. Transfer from county to state custody at present occurs within several weeks following sentencing, though timelines vary.
3. Federal Bureau of Prisons Inmate Locator (for federal inmates)
Individuals charged with federal offenses are held in federal custody and do not appear in county or state databases. The Federal Bureau of Prisons Inmate Locator provides a free search tool for locating individuals in federal custody. This resource should be used when the underlying offense involves federal law, such as drug trafficking across state lines, federal firearms violations, or immigration offenses. The locator returns the individual's current facility, projected release date, and register number.
Phone Search
Members of the public may contact the Williamson County Jail directly by telephone to inquire about an individual's custody status. The main jail line is (618) 997-6541. Callers should have the individual's full legal name and date of birth available to assist staff in locating the record. Telephone inquiries are accepted during regular business hours, Monday through Friday, 8:00 a.m. to 4:30 p.m.
In-Person Inquiry
Members of the public may visit the Williamson County Sheriff's Office in person to request inmate information. Government-issued photo identification is required. Staff at the front desk can provide current custody status, booking information, and scheduled court dates. A public access terminal may be available for self-service searches during business hours.
Williamson County Sheriff's Office / Jail
407 N. Monroe Street, Suite 114
Marion, IL 62959
Phone: (618) 997-6541
Hours: Monday–Friday, 8:00 a.m. – 4:30 p.m.
Williamson County Sheriff's Office
By Mail
Written requests for inmate information may be submitted by mail to the Williamson County Sheriff's Office at 407 N. Monroe Street, Suite 114, Marion, IL 62959. Requests should include the full legal name of the individual, date of birth, and the specific information being sought. Processing time for written requests varies and is subject to the volume of requests received by the office.
Search Tips
- Use the individual's full legal name as it appears on official identification
- Attempt name variations, including nicknames, maiden names, and alternate spellings
- Include the date of birth to narrow results when multiple individuals share the same name
- Search by booking number if that information is available
- Check both current inmates and recently released individuals
- Recent bookings may take several hours to appear in the online system
- Individuals who have been transferred to state or federal custody may not appear in the county roster
What If You Can't Find an Inmate
If an individual cannot be located through the county roster, the following explanations may apply:
- The individual may have been transferred to state prison; the IDOC Individual in Custody Search should be consulted
- The individual may be in federal custody; the Federal Bureau of Prisons Inmate Locator should be checked
- The individual may have been released
- The individual may be held in a neighboring county or jurisdiction
- A recent booking may not yet be reflected in the online system
- Name spelling variations may affect search results
Members of the public may contact the jail directly at (618) 997-6541 for assistance.
Are Inmate Records Public in Williamson County?
Inmate records in Williamson County are subject to public disclosure under the Illinois Freedom of Information Act (FOIA), codified at 5 ILCS 140. Under current law, records held by public bodies, including sheriff's offices and correctional facilities, are presumed open to inspection unless a specific statutory exemption applies. As stated by the Illinois Attorney General's Public Access Counselor, "The Freedom of Information Act reflects the public policy of the State of Illinois that all persons are entitled to full and complete information regarding the affairs of government."
Information That Is Public:
- Current inmate roster and population
- Booking information, including date and arresting agency
- Charges and charge descriptions
- Bond and bail amounts
- Booking photographs (mugshots)
- Current custody status
- Facility location
- Expected release date, where available
- Scheduled court dates
Information With Restricted Access:
- Medical records and health conditions
- Mental health information and treatment records
- Prescription medication information
- Detailed disciplinary records, which may be withheld under 5 ILCS 140/7
- Visitor contact lists, which may be restricted for security reasons
- Confidential informant status
- Juvenile detention records
- Witness protection participant information
- Specific cell assignments where disclosure would compromise facility security
Why Inmate Records Are Public:
The public availability of inmate records serves several governmental and civic functions, including promoting government transparency and accountability, supporting public safety awareness, enabling family members to locate detained individuals, facilitating legal proceedings and attorney representation, and meeting the operational needs of the bail bond industry.
Privacy Considerations:
Illinois law recognizes the need to balance public transparency with individual privacy interests. Sensitive personal information, including medical and mental health data, is protected from disclosure under both state and federal law. The public availability of booking photographs and charge information may affect the employment prospects and family relationships of individuals who are subsequently acquitted or whose charges are dismissed.
What Is Inmate Records in Williamson County?
Inmate records are official government documents created and maintained by correctional authorities to document the custody, classification, and legal status of individuals held in detention. In Williamson County, these records are created at the point of booking and updated throughout the period of custody. The primary custodian of county jail inmate records is the Williamson County Sheriff's Office. State prison records are maintained by the Illinois Department of Corrections.
The following distinctions apply to the types of records maintained within the corrections system:
- Booking records document the initial intake of an individual into custody, including personal identification information, charges, and bond information
- Custody records reflect the ongoing status of an individual during their period of detention, including housing assignments, classification level, and disciplinary actions
- Incarceration history encompasses the complete record of an individual's prior and current periods of detention within the jurisdiction
- Release records document the circumstances and date of an individual's discharge from custody, including the basis for release
The distinction between county jail, state prison, and federal prison is significant for records access purposes. County jail records are maintained by the Sheriff's Office and pertain to pre-trial detainees and individuals serving sentences of less than one year. State prison records are maintained by the Illinois Department of Corrections and pertain to individuals convicted of felonies with sentences exceeding one year. Federal prison records are maintained by the Federal Bureau of Prisons and pertain to individuals convicted of federal offenses.
What's Included in Inmate Records in Williamson County
Personal Identification Information:
- Full legal name and known aliases
- Inmate or booking number
- Date of birth and age
- Sex and gender
- Race and ethnicity
- Height, weight, and physical description
- Booking photograph
- Identifying marks, scars, and tattoos
Custody Information:
- Current facility location
- Housing unit or cell block designation (subject to security restrictions)
- Custody date and booking date
- Expected release date, if available
- Actual release date following discharge
- Custody status, including in custody, released, or transferred
Charges and Legal Information:
- Current charges and charge descriptions
- Case numbers and court jurisdiction
- Arrest date and arresting agency
- Warrant information, where applicable
Bond and Bail Information:
- Bond amount as set by the court
- Bond type, including cash, surety, or no bond
- Bond status, including posted or pending
- Bail bondsman information, where applicable
Court Information:
- Scheduled court dates and hearing types
- Court location and division
- Attorney information, where available
Sentence Information (for sentenced inmates):
- Conviction charges and sentence length
- Sentence start date and projected release date
- Parole eligibility date, where applicable
- Good time credit calculations
Previous Custody History:
- Prior bookings within the county
- Previous charges and historical custody dates
Administrative Information:
- Classification level, including minimum, medium, or maximum security
- Special housing needs or designations
- Work assignments and program participation, where publicly available
What's NOT Typically Included in Public Records:
- Medical history or active health conditions
- Mental health diagnoses or treatment records
- Prescription medication information
- Detailed disciplinary incident reports
- Visitor contact information
- Inmate account balances
- Telephone call logs
- Specific cell assignments withheld for security purposes
Williamson County Prison System
The Williamson County corrections system is operated under the authority of the Williamson County Sheriff's Office. The county jail serves as the primary detention facility for pre-trial detainees, individuals serving misdemeanor sentences, and felony holdovers awaiting transfer to state custody. The Sheriff oversees all jail operations, including staffing, classification, and inmate services.
Administration:
Williamson County Sheriff's Office
407 N. Monroe Street, Suite 114
Marion, IL 62959
Phone: (618) 997-6541
Williamson County Sheriff's Office
Facility Operations:
The Williamson County Jail houses pre-trial detainees, individuals sentenced to terms of less than one year, and individuals awaiting transfer to state correctional facilities. The facility operates a classification system that assigns inmates to appropriate security levels based on the nature of their charges, criminal history, and behavioral assessments.
Inmate Services:
The facility at present provides access to medical care, mental health services, substance abuse programming, religious services, and recreational opportunities. Educational programming, including GED preparation and literacy instruction, is available to eligible inmates. Legal services include access to a law library and provisions for attorney visitation.
Reentry Programs:
Pre-release planning services are available to assist individuals preparing for discharge. These services may include referrals for housing assistance, substance abuse treatment continuation, and employment support.
Oversight and Accountability:
The Williamson County Jail is subject to oversight by the Illinois Department of Corrections pursuant to 730 ILCS 5/3-15-2, which establishes standards for county correctional facilities. Grievance procedures are available to individuals in custody who wish to raise concerns regarding conditions of confinement.
Types of Correctional Facilities in Williamson County
Williamson County Jail
Williamson County Jail
407 N. Monroe Street
Marion, IL 62959
Phone: (618) 997-6541
Williamson County Sheriff's Office
The Williamson County Jail is the primary county-operated detention facility. It houses pre-trial detainees, individuals serving misdemeanor sentences, felony holdovers awaiting transfer to state custody, and, where applicable, individuals held on federal contract. The facility operates at multiple security classification levels.
Alternative Custody Programs
Home Detention and Electronic Monitoring
The Williamson County Sheriff's Office administers a home detention and electronic monitoring program for eligible individuals. Eligibility is determined by the court based on the nature of the offense, criminal history, and assessed risk level. Members of the public seeking information regarding this program should contact the Sheriff's Office at (618) 997-6541.
Work Release
A work release program may be available for eligible sentenced individuals, permitting participation in employment outside the facility during designated hours. Eligibility is subject to court approval and Sheriff's Office review.
State Prison Facilities Near Williamson County
The Big Muddy River Correctional Center, a state-operated facility, is located in Ina, Illinois, within Jefferson County, which borders Williamson County. This facility is operated by the Illinois Department of Corrections and is distinct from county jail operations. Individuals transferred from Williamson County to state custody may be assigned to this or other IDOC facilities statewide.
Big Muddy River Correctional Center
251 N. Illinois Highway 37
Ina, IL 62846
Phone: (618) 437-5300
Illinois Department of Corrections
Federal Detention Facilities
No federal detention facility is currently located within Williamson County. Individuals held on federal charges from the Williamson County area are at present housed at federal facilities designated by the Federal Bureau of Prisons. The Federal Bureau of Prisons Inmate Locator may be used to locate individuals in federal custody.
How To Find an Inmate in Williamson County for Free?
Multiple official resources are available at no cost to members of the public seeking to locate an individual in custody.
1. Official County Inmate Roster
The Williamson County Sheriff's Office maintains a free, publicly accessible inmate roster on its official website. No registration or account creation is required. The roster includes current inmates, booking information, charges, bond amounts, facility location, and booking photographs. The roster is updated on a daily basis.
2. State Department of Corrections Free Search
The IDOC Individual in Custody Search is available at no cost for locating individuals in Illinois state prison. Historical incarceration information is available for individuals who have previously been in IDOC custody.
3. Federal Bureau of Prisons Locator
The Federal Bureau of Prisons Inmate Locator provides a free search tool for individuals in federal custody. No fee is charged for basic inmate location inquiries.
4. Court Records Search
Court records maintained by the Williamson County Circuit Court may be used to verify an individual's custody status and upcoming court dates. The Williamson County Courthouse directory provides access to court information and resources. Members of the public may also access approved statewide standardized forms through the Illinois Courts website for matters related to court proceedings.
Williamson County Circuit Court
200 W. Jefferson Street
Marion, IL 62959
Phone: (618) 997-1301
Illinois Courts – Williamson County Courthouse
Free Phone Information:
Members of the public may call (618) 997-6541 to request basic inmate information at no charge. Callers should have the individual's full legal name and date of birth available. Telephone inquiries are accepted during regular business hours.
Free In-Person Search:
Members of the public may visit the Williamson County Sheriff's Office at 407 N. Monroe Street, Marion, IL 62959, during business hours to conduct an in-person inquiry. Staff assistance is available, and no fee is charged for basic information requests.
What's Free vs. What Costs Money:
The following services are provided at no cost:
- Online inmate search and current roster access
- Current custody status inquiries
- Basic inmate information by telephone
- In-person information requests at the Sheriff's Office
The following services are subject to fees:
- Sending money to an individual in custody
- Video visitation services
- Telephone calls initiated by an individual in custody
- Commissary orders placed on behalf of an individual in custody
- Certified copies of booking records
- Comprehensive background check reports
Members of the public are advised to use official government websites for inmate searches. Numerous third-party websites charge fees for information that is available at no cost through official sources. Members of the public should verify that any website consulted carries a .gov domain before submitting personal information or payment.