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 24, 2026.
Mountrail County, North Dakota, has about 9,500 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Mountrail County is held at the county jail, run by the Mountrail 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: Mountrail County public records, Mountrail County arrest records, Mountrail County warrants, Mountrail County criminal records, Mountrail County court records, North Dakota arrest records and North Dakota inmate search.
Finding Someone in Custody in Mountrail County
A person kept in custody after an arrest in Mountrail County is held at the county jail, run by the Mountrail County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Mountrail County Sheriff's Office at co.mountrail.nd.us/pages/mountrail-county-correctional-center (page title: Mountrail County Correctional Center | Mountrail County), phone 701-628-8900, Tues and Thurs 8am-11am, 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 701-628-8900.
The Mountrail County Jail by the Numbers
On an average day in 2019 the jail held about 16 people. Its rated capacity in 2019 was 42 beds, and it ran at 38 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Mountrail County has about 9,500 residents (2024 Census Bureau estimate), so the jail holds about 17 people for every 10,000 residents.
Who Books People Into the Mountrail County Jail
The Mountrail County Sheriff's Office and the agencies that report for New Town and Stanley make the arrests that end in a booking in Mountrail County.
The largest arrest counts reported to the FBI were Stanley's 107 for 2024, New Town's 82 for 2022 and the Mountrail County Sheriff's Office's 57 for 2024.
Together, the two agencies in Mountrail County with all twelve months of 2024 on file reported 164 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 Mountrail 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 Mountrail County serves the sentence in a facility of the North Dakota Department of Corrections and Rehabilitation, whose inmate locator is at docr.nd.gov/resident-lookup.
Frequently Asked Questions
How do I find an inmate in Mountrail County?
Ask the Mountrail County Sheriff's Office at 701-628-8900; its jail page SearchSystems verified is at co.mountrail.nd.us.
How many people are in the Mountrail County jail?
About 16 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 42 beds.
What is the phone number for the Mountrail County jail?
701-628-8900, the number on the page of the Mountrail County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Mountrail County go?
To a facility of the North Dakota Department of Corrections and Rehabilitation; its inmate locator is at docr.nd.gov/resident-lookup.
Is this the official Mountrail 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.