Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest and crime 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 23, 2026 and September 25, 2026.
Longmont, Colorado, in Boulder County, has about 100,000 residents (2024 Census Bureau estimate). In Colorado the public criminal record is the court file, kept by the clerk of the combined court; the statewide criminal history kept by the Colorado Bureau of Investigation is open to anyone who asks. This guide says where each record of a criminal case from Longmont is kept and how it is seen.
This guide covers the court file, the statewide record, local arrest records, the crimes behind the records, the prosecutor, sex offender registry, records requests and common questions.
Related guides: Longmont public records, Boulder County criminal records, Longmont arrest records, Longmont warrants, Longmont inmate search, Longmont court records, Colorado arrest records and Colorado inmate search.
Criminal Cases in the Boulder County District Court
In Colorado the public criminal record is the court file. Criminal cases from Longmont are heard by the Boulder County District Court, which hears felonies, civil cases over $25,000, divorces, probate and juvenile matters; the County Court takes misdemeanors, traffic cases and civil cases up to $25,000, and the file of each case is kept by the clerk of the combined court.
The court records page SearchSystems verified for the county is at coloradojudicial.gov/courts/trial-courts/boulder-county (page title: Boulder County | Colorado Judicial Branch), phone (303)441-3750, 1035 Kimbark St Longmont, CO 80501, mont Courthouse Hours: Monday - Friday 8:00 a.m. - 5:00 p.m., which answered when SearchSystems opened it on September 23, 2026.
Colorado has no single public index of every trial court case; each court's records are looked up through that court.
The Colorado Criminal History and Your Own Copy
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. The result is the repository record, what agencies reported to the state, which is wider than one county's court index but can lag it.
To see your own record, the route is a name-based or fingerprint-based request to the Colorado Bureau of Investigation. The state page SearchSystems verified for it is at cbi.colorado.gov/records-background-checks/internet-criminal-histor....
Arrest Records Kept Locally in Longmont
The Boulder County Sheriff's Office and the agency that reports for Longmont (filed by the FBI as Longmont Police Department) keep the arrest records in and around Longmont: the report and the booking record of each arrest stay with the agency that made it, separate from the court file and from the state repository.
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); each keeps the records of its own arrests.
The Erie Police Department is listed by the FBI across two counties including Boulder County, so its arrests are not broken out for Boulder County here.
Together, the five agencies in Boulder County with all twelve months of 2025 on file reported 7,765 arrests to the FBI that year; how each case ended is in the court file, not in the arresting agency's.
The agencies and their counts, year by year, are in Longmont arrest records.
The Crimes Behind the Records: Longmont in 2025
The agency that reports for Longmont had 350 violent and 2,438 property crimes reported for 2025; each one is a report on file with it, and each arrest that follows is the start of a criminal record.
The District Attorney for Boulder County
Charges in Boulder County are filed by the District Attorney, which reviews the arrests of every agency in the county and brings the cases in the Boulder County District Court or the County Court.
The office's page SearchSystems verified is at bouldercounty.gov/district-attorney (page title: District Attorney's Office | Boulder County), phone 303-441-3700, 80302, which answered when SearchSystems opened it on September 23, 2026.
The Sex Offender Registry for Longmont
Registered sex offenders living in Longmont are listed on the Colorado Sex Offender Registry, run by the Colorado Bureau of Investigation at apps.colorado.gov/apps/dps/sor. Only sexually violent predators, multiple offenders and adults convicted of felony sex offenses appear on the statewide site; local police and sheriffs hold the full list.
Registration itself is done in person with the local agency where the registrant lives: the sheriff's office, or the city police in a city with its own department.
Asking an Agency in Boulder County for a Record
An arrest report, a booking record or a local criminal history letter comes from the agency that holds it, not from the court.
Under the Colorado Open Records Act a county office must answer a request 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. The county records request page SearchSystems verified is at bouldercountyco.govqa.us/WEBAPP/_rs/(S(040pjzlu0pbmmyei4elguzgb))/s... (page title: BOULDER COUNTY COLORADO PUBLIC RECORDS REQUEST CENTER).
Frequently Asked Questions
Are criminal 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.
Can I search Longmont criminal cases online?
The court records page SearchSystems verified for the county is at coloradojudicial.gov (page title: Boulder County | Colorado Judicial Branch).
How do I get my own Colorado criminal history?
Through a name-based or fingerprint-based request to the Colorado Bureau of Investigation.
Who prosecutes crimes in Longmont?
The District Attorney, reached at 303-441-3700, which files its cases in the Boulder County District Court or the County Court.
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.