Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones the agency reported to the FBI, through 2025. 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 25, 2026.
Longmont, Colorado, in Boulder County, has about 100,000 residents (2024 Census Bureau estimate), and its arrests are reported to the FBI by an agency of its own. An arrest in the city leaves the same records whoever makes it: the arresting agency's report, the record of anyone held at the county jail, and, if the District Attorney files charges, a case in the Boulder County District Court. This guide says who keeps each one, what it costs and who may see it, with the arrest counts the agency reported.
This guide covers who makes arrests, how many arrests, booking and the jail, finding an arrest, copies and common questions.
Related guides: Longmont public records, Boulder County arrest records, Colorado arrest records and Colorado inmate search.
Who Makes Arrests in Longmont
The FBI lists Longmont with an arrest reporting agency of its own, filed as Longmont Police Department. It reported 2,378 arrests for 2025. A city is listed separately whether the officers are the city's own or the sheriff's under contract; the FBI's list does not say which.
Outside the city, the Boulder County Sheriff's Office is the county agency. It reported 1,242 arrests for 2025.
The FBI's agency list also places these agencies in Boulder County: Colorado Department of Revenue in Marijuana Enforcement Criminal Investigation, Boulder County (state agency); the University of Colorado at Boulder (campus police).
How Many Arrests Longmont Reports
Each agency reports its arrests to the FBI by month, and the FBI publishes them on the Crime Data Explorer. These are the full-year totals, all offenses, as the FBI held them on October 8, 2026; a year with months missing or not reported is left out.
- Longmont: 2,378 for 2025, 3,073 for 2024, 2,761 for 2023, 2,589 for 2022, 2,404 for 2021 and 2,268 for 2020.
Longmont's 2,378 arrests in 2025 were down 23 percent from 3,073 in 2024.
Through August 2026, Longmont reported 1,311 arrests, against 1,663 in the same months of 2025.
Across Boulder County, the five agencies with all twelve months of 2025 on file reported 7,765 arrests between them.
Booking: Where People Arrested in Longmont Are Held
A person kept in custody after an arrest in Longmont is held at the county jail, whichever agency made the arrest, apart from the short stay some city departments' own holding cells allow; a person cited and released at the scene is not booked at all. The jail's record of each person held, with the charges, is a public record of the arrest, and the court file takes over from there.
On an average day in 2025 the jail held about 320 people, down from about 410 in 2019. Its rated capacity in 2025 was 543 beds, and it ran at 59 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
SearchSystems opened and checked the custody page of the Boulder County Sheriff's Office at bouldercounty.gov/safety/jail/listing-and-booking-reports (page title: Daily Booking and Listing Reports | Boulder County), phone 303-441-3600, 5600 Flatiron Parkway Boulder, CO 80301, Monday - Friday 8 a.m. - 5 p.m., which answered when SearchSystems opened it on September 23, 2026.
That page is the place to look for someone who was 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.
A person sentenced to prison serves the sentence in a facility of the Colorado Department of Corrections, whose inmate locator is at cdoc.colorado.gov.
How to Find Out About an Arrest in Longmont
An arrest in Longmont can be traced in three places, depending on where the case stands: the custody page of the Boulder County Sheriff's Office described above, for anyone booked into the county jail; the case index of the Boulder County District Court, which shows whether charges were filed and the next court date (the court records page SearchSystems verified is at coloradojudicial.gov/courts/trial-courts/boulder-county, phone (303)441-3750); the District Attorney, which decides whether an arrest becomes a charge (its page is at bouldercounty.gov/district-attorney, phone 303-441-3700).
Colorado is one of the states that lets anyone look up another person's statewide criminal history: the state runs an online name-based criminal history check open to the public, through the Colorado Bureau of Investigation. That record shows what agencies reported to the state, which is wider than one county's court index but can lag it.
Getting a Copy of an Arrest Record in Longmont
An arrest report belongs to the agency whose officer wrote it, and that agency releases it, not the court or the jail. Under the Colorado Open Records Act the agency must answer within 3 working days, extendable to 7 when there are extenuating circumstances, and it may charge research and retrieval time after the first hour, plus copying.
- An arrest by the Longmont police: the police records page SearchSystems verified at longmontcolorado.gov/public-safety/public-safety-services/reports-o... (page title: Reports | Obtaining Fire/Police | City of Longmont), phone 719-597-1277, 225 Kimbark Street, Longmont, CO 80501, Monday - Friday, 7 am to 6 pm., which answered when SearchSystems opened it on September 25, 2026.
- An arrest by the Boulder County Sheriff's Office: ask its records unit, reached through the office at 303-441-3600.
- A defendant who has been charged gets the report through the case: the District Attorney, 303-441-3700, handles discovery for pending cases.
- The court file of a case that was filed: the Boulder County District Court, through the court records page at coloradojudicial.gov, phone (303)441-3750.
- Any county record that is not posted: the county records request page SearchSystems verified is at bouldercountyco.govqa.us (page title: BOULDER COUNTY COLORADO PUBLIC RECORDS REQUEST CENTER).
- Your own statewide record: a name-based or fingerprint-based request to the Colorado Bureau of Investigation.
The Boulder County guide covers every agency in the county: Boulder County arrest records.
Frequently Asked Questions
How many arrests are made in Longmont each year?
Longmont reported 2,378 arrests to the FBI for 2025, its latest full year.
How do I find out if someone is in jail in Longmont?
Look on the custody page of the Boulder County Sheriff's Office at bouldercounty.gov, or call 303-441-3600. It covers people booked into the county jail.
Where are people arrested in Longmont booked?
Those kept in custody go to the county jail, run by the Boulder County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in Longmont?
The court files of criminal cases are public, and so is the statewide criminal history kept by the Colorado Bureau of Investigation: the state runs an online name-based criminal history check open to the public. The arrest report itself is released by the agency that made the arrest, under the Colorado Open Records Act.
How do I get a copy of an arrest report in Longmont?
From the agency that made the arrest: the Longmont police for its own arrests, the Boulder County Sheriff's Office for the sheriff's. Under the Colorado Open Records Act the answer is due within 3 working days, extendable to 7 when there are extenuating circumstances; the county records request page SearchSystems verified is at bouldercountyco.govqa.us.
Is this the official Longmont 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.