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 September 30, 2026.
Nampa, Idaho, in Canyon County, has about 117,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Nampa is held at the county jail, run by the Canyon 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: Nampa public records, Canyon County inmate search, Nampa arrest records, Nampa warrants, Nampa criminal records, Nampa court records, Idaho arrest records and Idaho inmate search.
Finding Someone in Custody in Nampa
A person kept in custody after an arrest in Nampa is held at the county jail, run by the Canyon County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Canyon County Sheriff's Office at jailroster.canyoncounty.id.gov (page title: Jail Roster), phone (208) 454-7541, which answered when SearchSystems opened it on September 30, 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 Canyon County Jail by the Numbers
On an average day in 2023 the jail held about 430 people, up from about 420 in 2019. Its rated capacity in 2023 was 525 beds, and it ran at 82 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Canyon County has about 267,000 residents (2024 Census Bureau estimate), so the jail holds about 16 people for every 10,000 residents.
Who Books People Into the Canyon County Jail
The Canyon County Sheriff's Office and the agency that reports for Nampa (filed by the FBI as Nampa Police Department) make the arrests that end in a booking in and around Nampa.
The largest arrest counts reported to the FBI were Nampa's 2,622 for 2025, Caldwell's 1,680 for 2024 and the Canyon County Sheriff's Office's 1,177 for 2025.
Together, the five agencies in Canyon County with all twelve months of 2025 on file reported 4,145 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 Nampa arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Idaho Department of Correction lists its inmates at idoc.idaho.gov/content/prisons/resident-client-search.
Frequently Asked Questions
How do I find an inmate in Nampa?
Look on the custody page of the Canyon County Sheriff's Office at jailroster.canyoncounty.id.gov, or call (208) 454-7541. It covers people booked into the county jail.
How many people are in the Canyon County jail?
About 430 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 525 beds.
What is the phone number for the Canyon County jail?
(208) 454-7541, the number on the page of the Canyon County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Canyon County go?
To a facility of the Idaho Department of Correction; its inmate locator is at idoc.idaho.gov.
Is this the official Nampa website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.