There are currently 68 properties with a median home value in New Castle, CO 81647 of $443,600. The median list price per square foot in New Castle, CO 81647 is $284. Of the total homes in New Castle, CO 81647 97% are for sale, 3% are for rent, and 37% are single family homes. New Castle, CO 81647 represents 0% of home addresses in the United States. Home values in New Castle, CO 81647 are Infinity% above the median home value in the United States. Interested in knowing how much your home in New Castle, CO 81647 is worth? The Homes.com Automated Valuation Model (AVM) provides an estimate of the home value of every on and off market property in the US.