Keystone is a home rule town and a census-designated place located in and governed by Summit County, Colorado, United States. The CDP is a part of the Breckenridge, CO Micropolitan Statistical Area. The population of the Keystone CDP was 1,369 at the United States Census 2020. The Dillon post office serves Keystone postal addresses. The Keystone C…Keystone is a home rule town and a census-designated place located in and governed by Summit County, Colorado, United States. The CDP is a part of the Breckenridge, CO Micropolitan Statistical Area. The population of the Keystone CDP was 1,369 at the United States Census 2020. The Dillon post office serves Keystone postal addresses. The Keystone CDP includes the Keystone Resort and Keystone village. Keystone residents voted to incorporate in March 2023.
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