The Weld County Sheriff's Office is asking for the public to keep an eye out for a 20-year-old woman reported missing four years ago.

Nicole Silvers was last seen in the early morning hours of April 9, 2014, sitting in a dark blue or black 1980s model sedan outside the 1000 block of Sunset Street in Longmont, the sheriff's office said.

Before her disappearance, Silvers was described as 5-foot-8, 135 pounds with blue eyes and dyed red hair. She was working at Pizza Plus in Mead and attending Mead High School. She will turn 21 on June 24 of this year.

Nicole Silvers as she appeared before her disappearance on April 9, 2014. (Photo: Weld County Sheriff's Office)

Deputies have been actively searching for Silvers since April 12, 2014. Despite sightings of Silvers, they've gotten no workable leads.

Anyone with information on her whereabouts is asked to call the sheriff's office at 970-356-4015 or their tip line at 970-304-6464.

You can also remain anonymous and be eligible for a possible cash reward by calling Northern Colorado Crime Stoppers at 1-800-222-TIPS with any information.

Nicole Silvers as she appeared before her disappearance on April 9, 2014. (Photo: Weld County Sheriff's Office)