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.
Northumberland County, Pennsylvania, has about 90,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Northumberland County is held at the county jail, run by the Northumberland 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: Northumberland County public records, Northumberland County arrest records, Northumberland County warrants, Northumberland County criminal records, Northumberland County court records, Pennsylvania arrest records and Pennsylvania inmate search.
Finding Someone in Custody in Northumberland County
The county jail, run by the Northumberland County Sheriff's Office, holds everyone kept in custody after an arrest in Northumberland County, from every agency.
SearchSystems opened and checked the jail page of the Northumberland County Sheriff's Office at northumberlandcountypa.gov/sheriff (page title: Sheriff | County of Northumberland), phone 570.988.4155, Monday through Friday from 9:00 am to 3:00 pm., which answered when SearchSystems opened it on September 23, 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 570.988.4155.
The Northumberland County Jail by the Numbers
On an average day in 2023 the jail held about 150 people, down from about 260 in 2019. Its rated capacity in 2023 was 284 beds, and it ran at 53 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Northumberland County has about 90,000 residents (2024 Census Bureau estimate), so the jail holds about 17 people for every 10,000 residents.
Who Books People Into the Northumberland County Jail
The Northumberland County Sheriff's Office and the agencies that report for Sunbury, Shamokin, Milton, Mount Carmel (township), Mount Carmel, Northumberland and three more cities make the arrests that end in a booking in Northumberland County.
The FBI's agency list also places one state police unit, three state agencies and two other agencies in Northumberland County (the arrest records guide names each one).
The largest arrest counts reported to the FBI were Shamokin's 604 for 2025, Sunbury's 336 for 2023 and Mount Carmel's 276 for 2025.
Together, the eight agencies in Northumberland County with all twelve months of 2025 on file reported 1,378 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 Northumberland 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 Pennsylvania Department of Corrections lists its inmates at inmatelocator.cor.pa.gov.
Frequently Asked Questions
How do I find an inmate in Northumberland County?
Ask the Northumberland County Sheriff's Office at 570.988.4155; its jail page SearchSystems verified is at northumberlandcountypa.gov/sheriff.
How many people are in the Northumberland County jail?
About 150 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 284 beds.
What is the phone number for the Northumberland County jail?
570.988.4155, the number on the page of the Northumberland County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Northumberland County go?
To a facility of the Pennsylvania Department of Corrections; its inmate locator is at inmatelocator.cor.pa.gov.
Is this the official Northumberland 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.