Guffey is a census-designated place and post office in and governed by Park County, Colorado, United States. The Guffey post office has the ZIP Code 80820. At the United States Census 2010, the pop…Guffey is a census-designated place and post office in and governed by Park County, Colorado, United States. The Guffey post office has the ZIP Code 80820. At the United States Census 2010, the population of the Guffey CDP was 98, while the population of the 80820 ZIP Code Tabulation Area was 806 including adjacent areas. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area.
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