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 23, 2026 and October 4, 2026.
Union County, Tennessee, has about 21,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Union County is held at the county jail, run by the Union 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: Union County public records, Union County arrest records, Union County warrants, Union County criminal records, Union County court records, Tennessee arrest records and Tennessee inmate search.
Finding Someone in Custody in Union County
A person kept in custody after an arrest in Union County is held at the county jail, run by the Union County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Union County Sheriff's Office at unioncountytn.gov/sheriffs-department-and-jail (page title: Sheriff’s Department and Jail | Union County Tennessee), phone 865-992-2349, 130 Veteran's Street, Maynardville, TN 37807, a site that blocks automated checks (HTTP 403), so open it in a browser.
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 865-992-2349.
The Union County Jail by the Numbers
On an average day in 2024 the jail held about 74 people, down from about 98 in 2019. Its rated capacity in 2024 was 76 beds, and it ran at 97 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Union County has about 21,000 residents (2024 Census Bureau estimate), so the jail holds about 35 people for every 10,000 residents.
Who Books People Into the Union County Jail
The Union County Sheriff's Office and the agencies that report for Maynardville and Plainview make the arrests that end in a booking in Union County.
The largest arrest counts reported to the FBI were the Union County Sheriff's Office's 546 for 2025, Maynardville's 107 for 2024 and Plainview's 26 for 2024.
Together, the three agencies in Union County with all twelve months of 2024 on file reported 826 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 Union 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 Tennessee Department of Correction lists its inmates at foil.app.tn.gov/foil/search.jsp.
Frequently Asked Questions
How do I find an inmate in Union County?
Ask the Union County Sheriff's Office at 865-992-2349; its jail page SearchSystems verified is at unioncountytn.gov.
How many people are in the Union County jail?
About 74 on an average day in 2024, the latest year in the Vera Institute's jail data, against a rated capacity of 76 beds.
What is the phone number for the Union County jail?
865-992-2349, the number on the page of the Union County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Union County go?
To a facility of the Tennessee Department of Correction; its inmate locator is at foil.app.tn.gov/foil/search.jsp.
Is this the official Union 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.