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 24, 2026 and October 2, 2026.
South Portland, Maine, in Cumberland County, has about 27,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in South Portland is held at the county jail, run by the Cumberland 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: South Portland public records, Cumberland County inmate search, South Portland arrest records, South Portland warrants, South Portland criminal records, South Portland court records, Maine arrest records and Maine inmate search.
Finding Someone in Custody in South Portland
The county jail, run by the Cumberland County Sheriff's Office, holds everyone kept in custody after an arrest in South Portland, from every agency.
SearchSystems opened and checked the custody page of the Cumberland County Sheriff's Office at inmates.cumberlandcounty.revize.com/bookings (page title: Inmate Locator | Cumberland_County_ME_Inmates_App), a site that blocks automated checks (HTTP 403), so open it in a browser.
Someone booked recently shows on that page; someone cited and released at the scene, or held a few hours at a city station, does not.
The Cumberland County Jail by the Numbers
On an average day in 2021 the jail held about 290 people, down from about 400 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 570 beds, and it ran at 69 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Cumberland County has about 314,000 residents (2024 Census Bureau estimate), so the jail holds about 9 people for every 10,000 residents.
Who Books People Into the Cumberland County Jail
The Cumberland County Sheriff's Office and the agency that reports for South Portland (filed by the FBI as South Portland Police Department) make the arrests that end in a booking in and around South Portland.
The FBI's agency list also places one more agency in Cumberland County: the University of Southern Maine (campus police).
The largest arrest counts reported to the FBI were Portland's 1,913 for 2025, Westbrook's 754 for 2025 and the Cumberland County Sheriff's Office's 742 for 2025.
Together, the 12 agencies in Cumberland County with all twelve months of 2025 on file reported 5,392 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 South Portland arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Maine Department of Corrections lists its inmates at apps1.web.maine.gov/online/correctionssearch.
Frequently Asked Questions
How do I find an inmate in South Portland?
Look on the custody page of the Cumberland County Sheriff's Office at inmates.cumberlandcounty.revize.com/bookings. It covers people booked into the county jail.
How many people are in the Cumberland County jail?
About 290 on an average day in 2021, the latest year in the Vera Institute's jail data, against a rated capacity of 570 beds.
Where do people sentenced to prison in Cumberland County go?
To a facility of the Maine Department of Corrections; its inmate locator is at apps1.web.maine.gov/online/correctionssearch.
Is this the official South Portland 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.