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 September 30, 2026.
Rensselaer County, New York, has about 161,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Rensselaer County is held at the county jail, run by the Rensselaer 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: Rensselaer County public records, Rensselaer County arrest records, Rensselaer County warrants, Rensselaer County police reports, Rensselaer County property records, New York arrest records and New York inmate search.
Finding Someone in Custody in Rensselaer County
A person kept in custody after an arrest in Rensselaer County is held at the county jail, run by the Rensselaer County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Rensselaer County Sheriff's Office at rensco.com/325/Sheriff (page title: Sheriff | Rensselaer County, NY), phone 518-266-1900, 4000 Main Street Troy, NY 12180, which answered when SearchSystems opened it on September 30, 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 518-266-1900.
The Rensselaer County Jail by the Numbers
So far in 2026 the jail has held about 180 people on an average day, down from about 290 in 2019. Its rated capacity in 2023, the last year with a capacity figure, was 473 beds, and it ran at 40 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Rensselaer County has about 161,000 residents (2024 Census Bureau estimate), so the jail holds about 11 people for every 10,000 residents.
Who Books People Into the Rensselaer County Jail
The Rensselaer County Sheriff's Office and the agencies that report for Troy, Rensselaer, Hoosick Falls and Nassau make the arrests that end in a booking in Rensselaer County.
The FBI's agency list also places one more agency in Rensselaer County: Rensselaer Polytechnic Institute (campus police).
The largest arrest counts reported to the FBI were Troy's 858 for 2025, East Greenbush Town's 274 for 2025 and the Rensselaer County Sheriff's Office's 250 for 2025.
Together, the six agencies in Rensselaer County with all twelve months of 2025 on file reported 1,705 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 Rensselaer County arrest records.
From the Jail to State Prison
The jail holds people awaiting trial and people serving short sentences. A person sentenced to prison in Rensselaer County serves the sentence in a facility of the New York State Department of Corrections and Community Supervision, whose inmate locator is at nysdoccslookup.doccs.ny.gov.
Frequently Asked Questions
How do I find an inmate in Rensselaer County?
Ask the Rensselaer County Sheriff's Office at 518-266-1900; its jail page SearchSystems verified is at rensco.com/325/Sheriff.
How many people are in the Rensselaer County jail?
About 180 on an average day so far in 2026, against a rated capacity of 473 beds.
What is the phone number for the Rensselaer County jail?
518-266-1900, the number on the page of the Rensselaer County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Rensselaer 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 Rensselaer 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.