Mercer County Jail Inmate Search and Facility Lookup

Mercer County Jail Overview

Mercer County Jail is operated by the Mercer County Sheriff's Office as a county-jail and local-detention facility. The researched address is 802 E. Main, Princeton, MO 64673, and the main sheriff phone is 660-748-3165. The jail is the county's local holding point for people arrested by the sheriff, by Princeton Police, by MSHP, or by another agency when the person is held locally rather than cited, released, or transferred.

The jail's published security classification was not found beyond its role as a local county jail. The population held may include local arrestees, pretrial detainees, and county-sentence inmates when housed locally. Because Mercer County is small and no public roster was located, custody should be verified by phone before relying on a web search, making travel plans, sending mail, or attempting to post bond.

Mercer County Jail Capacity and Population

No current official Mercer County Jail capacity page, daily population dashboard, annual booking report, average daily population report, demographic breakdown, or average length-of-stay report was located. The strongest sourced facility figure found is historical: the Prisoners of the Census Missouri correctional-population table, derived from BJS/ICPSR correctional facility data, lists Mercer County Jail as local with 6 inmates on 12/31/2013. Treat that as a historical correctional-population figure, not a current sheriff-published capacity.

Mercer County's broader context is rural and small. Census QuickFacts reported a 2020 Census population of 3,538, a 2010 count of 3,785, a 2025 estimate of 3,452, land area of 453.84 square miles, and 2020 density of 7.8 people per square mile. Any current jail-rate calculation should be requested directly from the sheriff because no current daily count or annual booking source was located.

How to Look Up an Inmate at Mercer County Jail

No official Mercer County Jail online roster was located. For a person who may be held in local custody, the correct first step is the sheriff's phone line. Use statewide and federal systems only after deciding that the person may have been arrested by MSHP, charged in court, sentenced to state supervision, or moved into federal or immigration custody.

1. Call Mercer County Jail through the sheriff's office at 660-748-3165.
2. Give the person's full name, date of birth if known, approximate arrest date, and arresting agency.
3. Ask whether the person is currently held, released, transferred, or subject to a hold from another agency.
4. If MSHP made the arrest, search MSHP Arrest Reports and choose Mercer as the arrest county if helpful.
5. Search Missouri Case.net for filed charges, bond entries, hearings, warrants, and dispositions.
6. Use MODOC Offender Search for a sentenced or supervised state offender.
7. Use BOP or ICE ODLS for federal or immigration custody.

Missouri VINE/MOVANS and VINELink are notification channels rather than substitutes for direct jail confirmation. They may help with custody-status notifications where Missouri data is available.

Mercer County Jail Address and Contact

The jail and sheriff contact point is centralized at the county office address in Princeton. The Missouri Association of Counties lists general county office hours as 8:00 a.m.-4:30 p.m. Monday-Friday, closed legal holidays. Jail intake, dispatch, visitation, and lobby access may operate under different rules, so call before arriving.

For directions, use the Google Maps-recognized address 802 E Main St, Princeton, MO 64673. Princeton is reached by U.S. Route 65 and U.S. Route 136. Official visitor parking, transit, and entrance rules were not published in the researched jail sources.

Visiting Someone at Mercer County Jail

No official Mercer County Jail visitation schedule was located. That includes no confirmed public schedule for in-person visits, no confirmed video-visitation vendor, no posted visitor approval process, no visitor dress-code page, and no published child-visitor rules. Call the sheriff before traveling and ask whether the person is still held, whether visits are currently allowed, which entrance to use, what identification is required, what property must be left outside, and whether a court transport or emergency has cancelled visits.

Mail, Phone, and Money at Mercer County Jail

No official Mercer County-specific mail policy, phone provider, commissary vendor, deposit vendor, fee table, or inmate account page was located. Confirm every rule before sending anything. Ask whether the mailing address must include the inmate's full name, booking number, or housing location; whether books or photos are allowed; whether money orders are accepted; whether a kiosk or online vendor exists; and what happens to funds if the person is released or transferred.

Booking and Intake at Mercer County Jail

Mercer County's sheriff did not publish a detailed booking workflow in the researched sources. A local booking may involve transport to the jail, identity confirmation, search and security screening, property inventory, fingerprints, booking photo if performed, medical or mental-health screening, charge or warrant entry, and release, transfer, or housing. Missouri law also gives context: RSMo 221.120 addresses necessary medical attention for sick county jail prisoners, and RSMo 221.515 authorizes jailers to serve arrest warrants on inmates and arrest escaped prisoners.

Bond details are not published on a Mercer County jail page. Call the sheriff to ask whether bond has been set, what amount applies, whether any hold blocks release, and what payment methods are accepted. Then check Case.net or contact the Mercer County Circuit Clerk-Recorder at 660-748-4335 for court-filed charges, case numbers, hearing dates, warrants, and bond-condition changes. The prosecutor's office number in the research is 660-748-3332.

Records and Mugshot Requests for Mercer County Jail

A person seeking releasable booking records or a booking photo should first confirm that the person was booked into Mercer County Jail. Then prepare a written Sunshine Law request to the Mercer County Sheriff's Office. Include the person's name, date of birth if known, approximate arrest or booking date, arresting agency, and the specific records sought. Potentially relevant categories include booking date, arresting agency, booking or arrest number, charge descriptions, bond information, releasable hold information, release or transfer status, and mugshot if releasable.

Missouri public-record boundaries matter. RSMo 610.100 governs arrest and incident records. Records can be closed or redacted when an investigation, victim privacy, juvenile information, closed case outcome, or expungement rule applies. No official Mercer County mobile sheriff app or Princeton Police app with a roster feature was located.

About Mercer County Jail

Mercer County Jail functions as a small local jail in a rural north Missouri county on the Iowa border. No official county page was located for jail programs, accreditation, pod layout, medical unit details, reentry services, work release, grievance procedures, or jail-construction updates. No state prison, federal prison, ICE facility, or separate Princeton city jail was identified inside Mercer County.

The county office cluster at 802 E. Main is important for custody follow-up because the sheriff, prosecutor, and circuit clerk-recorder are all tied to that same courthouse-area address in researched directory sources. The sheriff handles jail custody and booking records, the prosecutor handles charging decisions, and the circuit clerk handles court files. Use the right office for the right record.