There are more than 30 unsolved and open cases in Nothern Colorado counties of Larimer and Weld right now.

These cases are cold, meaning they are no longer being actively pursued due to a lack of evidence.

However, that doesn't mean they are unsolvable — it's always possible that someone knows something.

While each case poses a frustrating mystery, here are the 10 most puzzling cold cases in Northern Colorado.

Anyone with information about these cases is asked to contact local law enforcement.

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Northern Colorado's Most Puzzling Cold Cases