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 26, 2026.
Milliken, Colorado, in Weld County, has about 9,100 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Milliken is held at the county jail, run by the Weld 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: Milliken public records, Weld County inmate search, Milliken arrest records, Milliken warrants, Milliken criminal records, Milliken court records, Colorado arrest records and Colorado inmate search.
Finding Someone in Custody in Milliken
The county jail, run by the Weld County Sheriff's Office, holds everyone kept in custody after an arrest in Milliken, from every agency.
SearchSystems opened and checked the jail page of the Weld County Sheriff's Office at weldsheriff.com/Services/Jail-Reports (page title: Jail Reports Weld Sheriff), phone 970-356-4015, which answered when SearchSystems opened it on September 23, 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 970-356-4015.
The Weld County Jail by the Numbers
On an average day in 2025 the jail held about 590 people, down from about 740 in 2019. Its rated capacity in 2025 was 1,068 beds, and it ran at 56 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Weld County has about 370,000 residents (2024 Census Bureau estimate), so the jail holds about 16 people for every 10,000 residents.
Who Books People Into the Weld County Jail
The Weld County Sheriff's Office and the agency that reports for Milliken (filed by the FBI as Milliken Police Department) make the arrests that end in a booking in and around Milliken.
The FBI's agency list also places these agencies in Weld County: the University of Northern Colorado (campus police); Weld County Drug Task Force (other agency).
The Brighton Police Department, the Northglenn Police Department, the Longmont Police Department and one more are each listed by the FBI across several counties including Weld County, so their arrests are not broken out for Weld County here.
The largest arrest counts reported to the FBI were Greeley's 5,337 for 2025, the Weld County Sheriff's Office's 1,702 for 2025 and Evans's 747 for 2025.
Together, the 21 agencies in Weld County with all twelve months of 2025 on file reported 10,660 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 Milliken arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Colorado Department of Corrections lists its inmates at cdoc.colorado.gov.
Frequently Asked Questions
How do I find an inmate in Milliken?
Ask the Weld County Sheriff's Office at 970-356-4015; its jail page SearchSystems verified is at weldsheriff.com/Services/Jail-Reports.
How many people are in the Weld County jail?
About 590 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 1,068 beds.
What is the phone number for the Weld County jail?
970-356-4015, the number on the page of the Weld County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Weld County go?
To a facility of the Colorado Department of Corrections; its inmate locator is at cdoc.colorado.gov.
Is this the official Milliken 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.