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Jefferson County Sheriff's Office

About Us

Serving Jefferson County with integrity, professionalism, and dedication.

Sheriff Reggie Marinelli in uniform
Sheriff

Reggie Marinelli

First Female Sheriff of Jefferson County

Sheriff Reggie Marinelli is a 40-year veteran of the Jefferson County Sheriff's Office and has served as Sheriff since January 2023. Throughout her distinguished career, she has served in every division of the agency, providing her with a deep understanding of law enforcement operations, investigations, detention services, and community safety.

Prior to being elected as Sheriff she worked as the Volunteer Coordinator for the agency and preceded that assignment with one in the detention facility, where she was the acting PREA Coordinator and overseeing the Moral Reconation Therapy being offered to the inmates within the facility. Prior to that she spent three years as the Commander of the West Metro Drug Task Force where her duties included supervision of undercover operations, managing an office of 24 personnel from 6 different organizations, administering a large budget and overseeing Asset Forfeiture funds both locally and federally.

Prior to transferring to the Drug Task Force, Reggie served as a Lieutenant in the Jefferson County Detention Facility. Preceding that assignment, she oversaw daily scheduling and supervision of a shift of deputies on patrol. As a deputy, Reggie began her career in Detentions, moving forward then to the patrol division where she served for many years. Just prior to promoting, Reggie served several years as an Investigator handling crimes against persons. She has worked many cases in coordination with other agencies on statewide indictments and became a local expert in the Satanic Occult while in investigations.

During her tenure Reggie has been responsible for writing and overseeing policy, contracts and grants, she took part in the initial development of the Sheriff’s Office accreditation process with CALEA and assisted in coordinating a statewide forum in 1994 addressing Violent Youth Crime in Colorado.

Reggie taught for many years in her agency's Law Enforcement Academy and is currently teaching Critical Incident within a Facility for the County Sheriffs of Colorado and she is also doing consultant work for The Moss Group, traveling all over the United States teaching others in Investigative Techniques, Processing of crime scenes and Preservation of evidence, to include case preparation for trial.

Sheriff Marinelli holds a bachelor’s degree in Criminal Justice and is working on her Masters in Criminal Justice from American Military University.

Key Priorities

Employee Wellness

Mental health support center for deputies with dedicated staff, chaplains, and volunteers

Recruitment & Training

Bolstering recruitment and enhancing training opportunities for all employees

Reducing Recidivism

Expanding evidence-based and alternative programming in the jail

Wildfire Prevention

Multi-agency coordination for prevention, preparation, and community communication

Undersheriff

Mike Prange

Undersheriff Mike Prange is a thirty-plus-year veteran of law enforcement, serving most of that time serving the citizens of Jefferson County. He holds a master's degree in organizational management, and his undergraduate work was in computer information systems management. He has extensive managerial experience in detention and patrol operations, criminal investigations, recruitment, and training. As a manager in these areas, his experience extends to policy development, procedural effectiveness, training course development, internal investigations, business audits, the creation of accountability models, compliance with accreditation standards, and other laws and regulations.

Mike is recognized for his dedication to delivering high-quality, effective service and for fostering strong connections with residents and governmental partners. His leadership is grounded in integrity, collaboration, and transparency, and he is a passionate advocate for officer safety and overall well-being.

Mike is a veteran of the United States Air Force, which provided him a strong foundation for leadership and his commitment to service. He continues to enhance his leadership and is passionate about sharing his knowledge with others through teaching, mentoring, and coaching.

Key Responsibilities:

  • • Internal affairs and professional standards
Undersheriff Mike Prange in uniform

Contact Directory

Find the right department for your needs. Click to expand for contact details.

Emergency 911

For emergencies only

Non-Emergency Dispatch (303) 980-7300

Report crimes, request service

Hearing Impaired/TTY (303) 980-7335

Jail Main Line (303) 271-5444
Bond Information (303) 271-5444
Inmate Information (303) 271-5444
200 Jefferson County Parkway, Golden, CO 80401
Jail Lobby: 8 AM - 9 PM daily

Criminal Records (303) 271-5542
Civil Unit (303) 271-6580
Warrants Unit (303) 271-6475
Monday - Friday: 8 AM - 5 PM

Criminal Investigations (303) 271-5606
Cold Cases (303) 271-5195
Victim Services (303) 271-5339

Crime Prevention (303) 980-7300
Volunteer & Youth Programs (303) 271-6579
Complaints & Commendations (303) 271-5607

Animal Control (303) 271-5070
Traffic Complaints (303) 271-5677
Traffic Tickets (303) 271-5345
Evidence & Property (303) 271-5656