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 on September 23, 2026.
Nantucket County, Massachusetts, has about 15,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Nantucket County is held at the county jail, run by the Nantucket County Sheriff Department, 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: Nantucket County public records, Nantucket County arrest records, Nantucket County warrants, Nantucket County criminal records, Nantucket County court records, Massachusetts arrest records and Massachusetts inmate search.
Finding Someone in Custody in Nantucket County
The county jail, run by the Nantucket County Sheriff Department, holds everyone kept in custody after an arrest in Nantucket County, from every agency.
SearchSystems opened and checked the jail page of the Nantucket County Sheriff Department at nantucketcountysheriffoffice.com (page title: Nantucket County Sheriff Department), which answered when SearchSystems opened it on September 23, 2026.
That page is the office's jail information page rather than a roster.
The Nantucket County Jail by the Numbers
On an average day in 2024 the jail held about 17 people, down from about 21 in 2019. Its rated capacity in 2023, the last year with a capacity figure, was 41 beds, and it ran at 31 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Nantucket County has about 15,000 residents (2024 Census Bureau estimate), so the jail holds about 11 people for every 10,000 residents.
Who Books People Into the Nantucket County Jail
The Nantucket County Sheriff Department makes the arrests that end in a booking in Nantucket County.
The FBI's agency list also places one more agency in Nantucket County: the Nantucket County State Police (state police).
Nantucket reported 225 arrests to the FBI for 2025. 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 Nantucket 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 Nantucket County serves the sentence in a facility of the Massachusetts Department of Correction, whose inmate locator is at mass.gov/how-to/find-someone-housed-in-a-massachusetts-prison.
Frequently Asked Questions
How do I find an inmate in Nantucket County?
Ask the Nantucket County Sheriff Department; its jail page SearchSystems verified is at nantucketcountysheriffoffice.com.
How many people are in the Nantucket County jail?
About 17 on an average day in 2024, the latest year in the Vera Institute's jail data, against a rated capacity of 41 beds.
Where do people sentenced to prison in Nantucket County go?
To a facility of the Massachusetts Department of Correction; its inmate locator is at mass.gov.
Is this the official Nantucket 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.