Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 30, 2026 and October 2, 2026.
St. Mary Parish, Louisiana, has about 47,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in St. Mary Parish is held at the parish jail, run by the St. Mary Parish Sheriff's Office, and the jail's record of each person held is a public record. This guide says where to look for someone in custody, what the jail holds and who books people into it.
This guide covers the search, the jail, who books people, state prison and common questions.
Related guides: St. Mary Parish public records, St. Mary Parish arrest records, St. Mary Parish warrants, St. Mary Parish police reports, St. Mary Parish property records, Louisiana arrest records and Louisiana inmate search.
Finding Someone in Custody in St. Mary Parish
The parish jail, run by the St. Mary Parish Sheriff's Office, holds everyone kept in custody after an arrest in St. Mary Parish, from every agency.
SearchSystems opened and checked the custody page of the St. Mary Parish Sheriff's Office at stmaryso.com/inmate-roster/filters/current/booking_time=desc/1 (page title: Inmate Roster | St. Mary Parish Sheriff's Office, Louisiana | Sort Booking Time | Descending | Page 1), which answered when SearchSystems opened it on September 30, 2026.
Someone booked recently shows on that page; someone cited and released at the scene, or held a few hours at a city station, does not.
The St. Mary Parish Jail by the Numbers
On an average day in 2023 the jail held about 18 people, down from about 410 in 2019. Its rated capacity in 2023 was 100 beds, and it ran at 18 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
St. Mary Parish has about 47,000 residents (2024 Census Bureau estimate), so the jail holds about 4 people for every 10,000 residents.
Who Books People Into the St. Mary Parish Jail
The St. Mary Parish Sheriff's Office and the agencies that report for Morgan City, Franklin, Patterson, Berwick and Baldwin make the arrests that end in a booking in St. Mary Parish.
The largest arrest counts reported to the FBI were Baldwin's 1,152 for 2025, Morgan City's 750 for 2025 and the St. Mary Parish Sheriff's Office's 611 for 2025.
Together, the three agencies in St. Mary Parish with all twelve months of 2025 on file reported 2,513 arrests to the FBI that year. Those kept in custody were booked into the parish jail; a person cited and released at the scene was not.
The counts, agency by agency and year by year, are in St. Mary Parish arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Louisiana Department of Public Safety and Corrections lists its inmates at doc.la.gov.
Frequently Asked Questions
How do I find an inmate in St. Mary Parish?
Look on the custody page of the St. Mary Parish Sheriff's Office at stmaryso.com. It covers people booked into the parish jail.
How many people are in the St. Mary Parish jail?
About 18 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 100 beds.
Where do people sentenced to prison in St. Mary Parish go?
To a facility of the Louisiana Department of Public Safety and Corrections; its inmate locator is at doc.la.gov.
Is this the official St. Mary Parish website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official parish, court and state offices described above and does not hold records, charge for them or take requests.