Dunn's appearance has likely changed in that time, as she was only 13-years-old at the time of her disappearance (on December 27, 2010).
Volunteer search group Hope For Hailey has tried to depict how Dunn might currently appear by posting an age progression image on their Facebook page.
While the image is only an artist's depiction, it does give searchers a general guideline as to her possible appearance.
Searchers have looked for Hailey Dunn in cities across West Texas -- including Big Spring and Odessa.
Anyone who knows anything about Dunn's disappearance should call Colorado City Police at (325) 728-5294.