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 24, 2026 and October 4, 2026.
Coos County, New Hampshire, has about 31,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Coos County is held at the county jail, run by the Sheriff's Department - Coos county, NH, 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: Coos County public records, Coos County arrest records, Coos County warrants, Coos County criminal records, Coos County court records, New Hampshire arrest records and New Hampshire inmate search.
Finding Someone in Custody in Coos County
The county jail, run by the Sheriff's Department - Coos county, NH, holds everyone kept in custody after an arrest in Coos County, from every agency.
SearchSystems opened and checked the jail page of the Sheriff's Department - Coos county, NH at cooscountynh.gov/government/departments/sheriffs_department.php (page title: Coos county, NH), phone (603) 788-5598, 55 School Street Suite 101 Lancaster, NH 03584, Mon 8:00 am to 4:00 pm, which answered when SearchSystems opened it on September 24, 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 (603) 788-5598.
The Coos County Jail by the Numbers
On an average day in 2023 the jail held about 19 people, down from about 35 in 2019. Its rated capacity in 2023 was 61 beds, and it ran at 31 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Coos County has about 31,000 residents (2024 Census Bureau estimate), so the jail holds about 6 people for every 10,000 residents.
Who Books People Into the Coos County Jail
The Sheriff's Department - Coos county, NH and the agency that reports for Berlin make the arrests that end in a booking in Coos County.
The FBI's agency list also places one more agency in Coos County: the Coos County State Police (state police).
The largest arrest counts reported to the FBI were Berlin's 429 for 2025, Lancaster's 109 for 2025 and Gorham's 92 for 2025.
Together, the seven agencies in Coos County with all twelve months of 2025 on file reported 804 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 Coos 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 Hampshire Department of Corrections lists its inmates at business.nh.gov/inmate_locator.
Frequently Asked Questions
How do I find an inmate in Coos County?
Ask the Sheriff's Department - Coos county, NH at (603) 788-5598; its jail page SearchSystems verified is at cooscountynh.gov.
How many people are in the Coos County jail?
About 19 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 61 beds.
What is the phone number for the Coos County jail?
(603) 788-5598, the number on the page of the Sheriff's Department - Coos county, NH SearchSystems verified.
Where do people sentenced to prison in Coos County go?
To a facility of the New Hampshire Department of Corrections; its inmate locator is at business.nh.gov/inmate_locator.
Is this the official Coos 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.