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 September 28, 2026.
Rockville, Maryland, in Montgomery County, has about 68,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Rockville is held at the county jail, run by the Montgomery 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 and common questions.
Related guides: Rockville public records, Montgomery County inmate search, Rockville arrest records, Rockville warrants, Rockville criminal records, Rockville court records, Maryland arrest records and Maryland inmate search.
Finding Someone in Custody in Rockville
A person kept in custody after an arrest in Rockville is held at the county jail, run by the Montgomery County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Montgomery County Sheriff's Office at mcsojail.countygovservices.com/Home/CurrentInmates (page title: Current Inmates | Montgomery County Sheriff's Office), which answered when SearchSystems opened it on September 28, 2026.
That page is the place to look for someone booked recently. A person cited and released at the scene, or held only a few hours by a city department, will not be on it.
The Montgomery County Jail by the Numbers
On an average day in 2024 the jail held about 920 people, up from about 750 in 2019. Its rated capacity in 2023, the last year with a capacity figure, was 1,163 beds, and it ran at 77 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Montgomery County has about 1.1 million residents (2024 Census Bureau estimate), so the jail holds about 9 people for every 10,000 residents.
Who Books People Into the Montgomery County Jail
The Montgomery County Sheriff's Office, the Montgomery County Police Department and the agency that reports for Rockville (filed by the FBI as Rockville Police Department) make the arrests that end in a booking in and around Rockville.
The FBI's agency list also places these agencies in Montgomery County: the Montgomery County Maryland-National Capital Park Police (other agency); the Montgomery County State Police (state police).
The largest arrest counts reported to the FBI were the Montgomery County Police Department's 6,784 for 2025, Gaithersburg's 926 for 2025 and the Montgomery County Sheriff's Office's 841 for 2025.
Together, the six agencies in Montgomery County with all twelve months of 2025 on file reported 9,245 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 Rockville arrest records.
Frequently Asked Questions
How do I find an inmate in Rockville?
Look on the custody page of the Montgomery County Sheriff's Office at mcsojail.countygovservices.com. It covers people booked into the county jail.
How many people are in the Montgomery County jail?
About 920 on an average day in 2024, the latest year in the Vera Institute's jail data, against a rated capacity of 1,163 beds.
Is this the official Rockville website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.