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.
Mercer County, Pennsylvania, has about 108,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Mercer County is held at the county jail, run by the Mercer 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: Mercer County public records, Mercer County arrest records, Mercer County warrants, Mercer County criminal records, Mercer County court records, Pennsylvania arrest records and Pennsylvania inmate search.
Finding Someone in Custody in Mercer County
A person kept in custody after an arrest in Mercer County is held at the county jail, run by the Mercer County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Mercer County Sheriff's Office at mercercountypa.gov/sheriff (page title: Mercer County Sheriff's Office), phone 724 662 6135, 205 South Erie Street Mercer, PA 16137, MONDAY THRU THURSDAY 8:30 a.m. - 1:00 p.m., 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 724 662 6135.
The Mercer County Jail by the Numbers
On an average day in 2023 the jail held about 230 people, down from about 290 in 2019. Its rated capacity in 2023 was 310 beds, and it ran at 75 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Mercer County has about 108,000 residents (2024 Census Bureau estimate), so the jail holds about 21 people for every 10,000 residents.
Who Books People Into the Mercer County Jail
The Mercer County Sheriff's Office and the agencies that report for Hermitage, Sharon, Grove City, Greenville, Farrell, Sharpsville and four more cities make the arrests that end in a booking in Mercer County.
The FBI's agency list also places one state police unit, three state agencies, two other agencies and two campus police departments in Mercer County (the arrest records guide names each one).
The largest arrest counts reported to the FBI were Sharon's 745 for 2025, Hermitage's 605 for 2025 and Farrell's 357 for 2024.
Together, the 14 agencies in Mercer County with all twelve months of 2024 on file reported 2,206 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 Mercer 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 Mercer County serves the sentence in a facility of the Pennsylvania Department of Corrections, whose inmate locator is at inmatelocator.cor.pa.gov.
Frequently Asked Questions
How do I find an inmate in Mercer County?
Ask the Mercer County Sheriff's Office at 724 662 6135; its jail page SearchSystems verified is at mercercountypa.gov/sheriff.
How many people are in the Mercer County jail?
About 230 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 310 beds.
What is the phone number for the Mercer County jail?
724 662 6135, the number on the page of the Mercer County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Mercer County go?
To a facility of the Pennsylvania Department of Corrections; its inmate locator is at inmatelocator.cor.pa.gov.
Is this the official Mercer 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.