Reviewed and updated October 11, 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 11, 2026.
Aberdeen, Maryland, in Harford County, has about 18,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Aberdeen is held at the county jail, run by the Harford 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: Aberdeen public records, Harford County inmate search, Aberdeen arrest records, Aberdeen warrants, Aberdeen criminal records, Aberdeen court records, Maryland arrest records and Maryland inmate search.
Finding Someone in Custody in Aberdeen
A person kept in custody after an arrest in Aberdeen is held at the county jail, run by the Harford County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Harford County Sheriff's Office at harfordsheriff.org/detention/welcome (page title: Harford County Sheriff's Office:Welcome | Harford County Sheriff's Office), phone 410-838-6600, 1030 Rock Spring Road, Bel Air, MD 21014, which answered when SearchSystems opened it on October 11, 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 410-838-6600.
The Harford County Jail by the Numbers
On an average day in 2024 the jail held about 320 people, down from about 360 in 2019. Its rated capacity in 2022, the last year with a capacity figure, was 762 beds, and it ran at 45 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Harford County has about 266,000 residents (2024 Census Bureau estimate), so the jail holds about 12 people for every 10,000 residents.
Who Books People Into the Harford County Jail
The Harford County Sheriff's Office and the agency that reports for Aberdeen (filed by the FBI as Aberdeen Police Department) make the arrests that end in a booking in and around Aberdeen.
The FBI's agency list also places one more agency in Harford County: the Harford County State Police (state police).
The largest arrest counts reported to the FBI were the Harford County Sheriff's Office's 4,177 for 2025, Aberdeen's 555 for 2025 and Bel Air's 256 for 2025.
Together, the four agencies in Harford County with all twelve months of 2025 on file reported 5,234 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 Aberdeen arrest records.
Frequently Asked Questions
How do I find an inmate in Aberdeen?
Ask the Harford County Sheriff's Office at 410-838-6600; its jail page SearchSystems verified is at harfordsheriff.org/detention/welcome.
How many people are in the Harford County jail?
About 320 on an average day in 2024, the latest year in the Vera Institute's jail data, against a rated capacity of 762 beds.
What is the phone number for the Harford County jail?
410-838-6600, the number on the page of the Harford County Sheriff's Office SearchSystems verified.
Is this the official Aberdeen 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.