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, Ohio, has about 72,000 residents (2024 Census Bureau estimate), and arrests there are reported to the FBI by the Union County Sheriff's Office and two city agencies. An arrest leaves the same records whoever makes it: the arresting agency's report, the record of anyone held at the county jail, and, if the Prosecuting Attorney files charges, a case in the Union County Court of Common Pleas. This guide says who keeps each one, what it costs and who may see it, with the arrest counts each agency reported.
This guide covers who makes arrests, how many arrests, booking and the jail, finding an arrest, copies, cities and common questions.
Related guides: Union County public records, Ohio arrest records, Ohio inmate search and Ohio criminal records.
Who Makes Arrests in Union County
The Union County Sheriff's Office is the county agency that reports arrests to the FBI for Union County. It reported 86 arrests for 2025.
The FBI lists two cities in Union County with a reporting agency of their own, with the Census population and what each reported:
- Marysville, 29,276 residents: 185 arrests reported for 2025.
- Richwood, 2,575 residents: 13 arrests reported for 2023.
A city on that list is reported separately whether the officers are the city's own or the sheriff's under contract; the FBI's list does not say which.
The Plain City Police Department and the Dublin Police Department are each listed by the FBI across several counties including Union County, so their arrests are not broken out for Union County here.
How Many Arrests Each Agency Reports in Union County
Each agency reports its arrests to the FBI by month, and the FBI publishes them on the Crime Data Explorer. These are the full-year totals, all offenses, as the FBI held them on October 8, 2026; a year with months missing or not reported is left out.
- Marysville: 185 for 2025, 211 for 2024, 237 for 2023, 228 for 2022, 251 for 2021 and 260 for 2020.
- Union County Sheriff's Office: 86 for 2025, 136 for 2024, 173 for 2023, 136 for 2022, 137 for 2021 and 168 for 2020.
- Richwood: 13 for 2023, 25 for 2022, 14 for 2021 and 18 for 2020.
Together, the two agencies with all twelve months of 2025 on file reported 271 arrests that year. The same agencies with both 2025 and 2024 complete reported 271 in 2025 against 347 in 2024, down 22 percent.
Richwood reported only part of 2025 (11 months) and is left out of the totals.
Booking: Where People Arrested in Union County Are Held
A person kept in custody after an arrest in Union County is held at the county jail, whichever agency made the arrest, apart from the short stay some city departments' own holding cells allow; a person cited and released at the scene is not booked at all. The jail's record of each person held, with the charges, is a public record of the arrest, and the court file takes over from there.
On an average day in 2023 the jail held about 66 people, down from about 81 in 2019. Its rated capacity in 2023 was 74 beds, and it ran at 89 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
SearchSystems opened and checked the jail page of the Union County Sheriff's Office at unioncountyohio.gov/sheriff (page title: Union County, Ohio | Sheriff), phone 937-645-4110, 911 Location 221 West 5th Street Marysville, OH 43040, which answered when SearchSystems opened it on October 4, 2026.
A person sentenced to prison serves the sentence in a facility of the Ohio Department of Rehabilitation and Correction, whose inmate locator is at appgateway.drc.ohio.gov/OffenderSearch.
How to Find Out About an Arrest in Union County
For Union County the place to look is the Prosecuting Attorney, which decides whether an arrest becomes a charge (its page is at unioncountyohio.gov/Prosecuting-Attorney, phone 937-645-4190).
Ohio does not let the public search another person's statewide criminal history. The record kept by the Ohio Bureau of Criminal Investigation goes to the person it belongs to and to employers and agencies the law authorizes; for everyone else the court's own case index is the public record of an arrest that led to a charge.
Getting a Copy of an Arrest Record in Union County
The report of an arrest is released by the agency that made it; the jail and the court hold their own records of the same event, but not the report. Under the Ohio Public Records Act the agency must answer promptly, within a reasonable period of time, and it may charge the actual cost of copying.
- An arrest by the Union County Sheriff's Office: ask its records unit, reached through the office at 937-645-4110.
- An arrest in Marysville or Richwood: the records unit of the agency that reports for that city; the city guides linked above name each city's records office.
- A defendant who has been charged gets the report through the case: the Prosecuting Attorney, 937-645-4190, handles discovery for pending cases.
- Your own statewide record: a fingerprint-based WebCheck at any WebCheck location.
Cities in Union County: Who Reports the Arrests
The FBI lists a separate arrest reporting agency for two of the five cities in Union County: Marysville and Richwood. Milford Center, Magnetic Springs and Unionville Center have no separate reporting agency in the FBI's list.
Wherever in the county the arrest happens, a person kept in custody goes to the county jail and the case goes to the Union County Court of Common Pleas.
SearchSystems has a guide to the offices of these cities in Union County, with the 2024 Census Bureau population; a city with its own arrest records guide opens there:
- Marysville (29,276)
Frequently Asked Questions
How many arrests are made in Union County each year?
Marysville reported 185 arrests to the FBI for 2025, and the two agencies with every month of 2025 on file reported 271 between them.
How do I find out if someone is in jail in Union County?
Ask the Union County Sheriff's Office at 937-645-4110; its jail page SearchSystems verified is at unioncountyohio.gov/sheriff.
Where are people arrested in Union County booked?
Those kept in custody go to the county jail, run by the Union County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in Union County?
The court files of criminal cases in the Union County Court of Common Pleas are public and can be looked up through the court. The statewide criminal history kept by the Ohio Bureau of Criminal Investigation is not public; you can get your own. The arrest report itself is released by the agency that made the arrest, under the Ohio Public Records Act.
How do I get a copy of an arrest report in Union County?
From the agency that made the arrest: the Union County Sheriff's Office for its own arrests, or the agency that reports for the city where it happened. Under the Ohio Public Records Act the answer is due promptly, within a reasonable period of time.
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.