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 2, 2026.
Ontario County, New York, has about 113,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Ontario County is held at the county jail, run by the Ontario 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: Ontario County public records, Ontario County arrest records, Ontario County warrants, Ontario County police reports, Ontario County property records, New York arrest records and New York inmate search.
Finding Someone in Custody in Ontario County
A person kept in custody after an arrest in Ontario County is held at the county jail, run by the Ontario County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Ontario County Sheriff's Office at ontariocountyny.gov/1910/Incarcerated-Individual-Locator (page title: Incarcerated Individual Locator | Ontario County, NY), which answered when SearchSystems opened it on October 2, 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 Ontario County Jail by the Numbers
So far in 2026 the jail has held about 92 people on an average day, down from about 140 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 291 beds, and it ran at 49 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Ontario County has about 113,000 residents (2024 Census Bureau estimate), so the jail holds about 8 people for every 10,000 residents.
Who Books People Into the Ontario County Jail
The Ontario County Sheriff's Office and the agencies that report for Geneva, Canandaigua, Clifton Springs and Phelps make the arrests that end in a booking in Ontario County.
The largest arrest counts reported to the FBI were the Ontario County Sheriff's Office's 778 for 2024, Geneva's 707 for 2025 and Canandaigua's 452 for 2025.
Together, the four agencies in Ontario County with all twelve months of 2025 on file reported 1,165 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 Ontario 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 Ontario 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 Ontario County?
Look on the custody page of the Ontario County Sheriff's Office at ontariocountyny.gov. It covers people booked into the county jail.
How many people are in the Ontario County jail?
About 92 on an average day so far in 2026, against a rated capacity of 291 beds.
Where do people sentenced to prison in Ontario 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 Ontario 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.