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 23, 2026 and October 9, 2026.
Suffolk County, New York, has about 1.5 million residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Suffolk County is held at the county jail, run by the Suffolk County 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: Suffolk County public records, Suffolk County arrest records, Suffolk County warrants, Suffolk County criminal records, Suffolk County court records, New York arrest records and New York inmate search.
Finding Someone in Custody in Suffolk County
The county jail, run by the Suffolk County Sheriff's Office, holds everyone kept in custody after an arrest in Suffolk County, from every agency.
SearchSystems opened and checked the jail page of the Suffolk County Sheriff's Office at suffolkcountyny.gov/sheriff (page title: Suffolk County Government > Sheriff), phone (631) 852-2200, 100 Veterans Memorial Hwy P.O. Box 6100 Hauppauge, NY 11788, which answered when SearchSystems opened it on September 23, 2026.
That page is the office's jail information page rather than a roster, so a search for a particular person goes through the office at (631) 852-2200.
The Suffolk County Jail by the Numbers
So far in 2026 the jail has held about 1,090 people on an average day, up from about 990 in 2019. Its rated capacity in 2021, the last year with a capacity figure, was 1,793 beds, and it ran at 42 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Suffolk County has about 1.5 million residents (2024 Census Bureau estimate), so the jail holds about 7 people for every 10,000 residents.
Who Books People Into the Suffolk County Jail
The Suffolk County Sheriff's Office, the Suffolk County Police Department and the agencies that report for Amityville, Northport, Southampton (village), Southampton (town), Lloyd Harbor, Sag Harbor and nine more cities make the arrests that end in a booking in Suffolk County.
The FBI's agency list also places these agencies in Suffolk County: the Farmingdale State University of New York Police and the Stony Brook State University of New York Police (campus police).
The largest arrest counts reported to the FBI were the Suffolk County Police Department's 20,139 for 2023, Head of the Harbor's 1,152 for 2025 and the Suffolk County Sheriff's Office's 950 for 2025.
Together, the 14 agencies in Suffolk County with all twelve months of 2025 on file reported 3,782 arrests to the FBI that year. Those kept in custody were booked into the county jail; a person cited and released at the scene was not.
The counts, agency by agency and year by year, are in Suffolk County arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the New York State Department of Corrections and Community Supervision lists its inmates at nysdoccslookup.doccs.ny.gov.
Frequently Asked Questions
How do I find an inmate in Suffolk County?
Ask the Suffolk County Sheriff's Office at (631) 852-2200; its jail page SearchSystems verified is at suffolkcountyny.gov/sheriff.
How many people are in the Suffolk County jail?
About 1,090 on an average day so far in 2026, against a rated capacity of 1,793 beds.
What is the phone number for the Suffolk County jail?
(631) 852-2200, the number on the page of the Suffolk County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Suffolk County go?
To a facility of the New York State Department of Corrections and Community Supervision; its inmate locator is at nysdoccslookup.doccs.ny.gov.
Is this the official Suffolk County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.