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. Every office link was opened and checked against the office's own site between September 24, 2026 and October 2, 2026.
New Castle County, Delaware, has about 588,000 residents (2024 Census Bureau estimate). In Delaware the jails are the state's, so one locator covers everyone held after an arrest in New Castle County. 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, who books people and common questions.
Related guides: New Castle County public records, New Castle County arrest records, New Castle County warrants, New Castle County criminal records, New Castle County court records, Delaware arrest records and Delaware inmate search.
Finding Someone in Custody in New Castle County
Delaware has no county jails, so one search covers everyone held after an arrest in New Castle County: the Delaware Department of Correction runs every jail and prison in the state and lists the people it holds, awaiting trial or serving a sentence.
The Delaware Department of Correction's inmate locator is at doc.delaware.gov/views/inmate_locator.blade.shtml.
Who Books People
The New Castle County Police Department and the agencies that report for Wilmington, Newark, Middletown, Elsmere, New Castle, Townsend and two more cities make the arrests in New Castle County.
The FBI's agency list also places four state agencies, two other agencies, one campus police department and one state police unit in New Castle County (the arrest records guide names each one).
The Smyrna Police Department is listed by the FBI across two counties including New Castle County, so its arrests are not broken out for New Castle County here.
The largest arrest counts reported to the FBI were the New Castle County Police Department's 4,279 for 2025, Wilmington's 2,259 for 2025 and Newark's 781 for 2025.
Together, the eight agencies in New Castle County with all twelve months of 2025 on file reported 8,104 arrests to the FBI that year. Those kept in custody were booked; a person cited and released at the scene was not.
The counts, agency by agency and year by year, are in New Castle County arrest records.
Frequently Asked Questions
How do I find an inmate in New Castle County?
Through the Delaware Department of Correction's inmate locator at doc.delaware.gov; the department holds everyone in custody in Delaware.
Where do people sentenced to prison in New Castle County go?
To a facility of the Delaware Department of Correction; its inmate locator is at doc.delaware.gov.
Is this the official New Castle 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.